Here's one that you could use, I think.
Frozen ice world, dead dwarven civ, one dragon, 10k goblins, 9250'U surface temp. No soil on the surface, just ice.
Everything you need (soil, seeds, plants, wood, water) must be obtained/used from the cavern, and exists in this specific embark location. Candy is present, as are clowns.
Whatever non-metal/non-stone items you bring will be damaged/destroyed by cold, although animals will survive long enough to be brought underground, if you're quick enough.
17Z to magma from the surface.
worldgenCreated in DF v0.47.05.
[WORLD_GEN]
[TITLE:BLUE_EMU_COLD]
[SEED:QqgcqKCAgYQsyWaA28CC]
[HISTORY_SEED:wyM60OIyyWI0ckYsEgSq]
[NAME_SEED:MW4CMokGceqqKyEu2W4y]
[CREATURE_SEED:oeymY6kmcMwOQO0csKEI]
[DIM:17:17]
[EMBARK_POINTS:0]
[END_YEAR:200]
[BEAST_END_YEAR:200:-1]
[REVEAL_ALL_HISTORY:0]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:100:100:0:0]
[RAINFALL:100:100:0:0]
[TEMPERATURE:-1000:-1000:0:0]
[DRAINAGE:100:100:0:0]
[VOLCANISM:0:100:0:0]
[SAVAGERY:0:100:0:0]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[POLE:NORTH]
[MINERAL_SCARCITY:100]
[MEGABEAST_CAP:1]
[SEMIMEGABEAST_CAP:0]
[TITAN_NUMBER:0]
[TITAN_ATTACK_TRIGGER:0:0:0]
[DEMON_NUMBER:4]
[NIGHT_TROLL_NUMBER:0]
[BOGEYMAN_NUMBER:0]
[NIGHTMARE_NUMBER:0]
[VAMPIRE_NUMBER:0]
[WEREBEAST_NUMBER:0]
[WEREBEAST_ATTACK_TRIGGER:0:0:0]
[SECRET_NUMBER:0]
[REGIONAL_INTERACTION_NUMBER:0]
[DISTURBANCE_INTERACTION_NUMBER:0]
[EVIL_CLOUD_NUMBER:0]
[EVIL_RAIN_NUMBER:0]
[GENERATE_DIVINE_MATERIALS:0]
[ALLOW_DIVINATION:0]
[ALLOW_DEMONIC_EXPERIMENTS:0]
[ALLOW_NECROMANCER_EXPERIMENTS:0]
[ALLOW_NECROMANCER_LIEUTENANTS:0]
[ALLOW_NECROMANCER_GHOULS:0]
[ALLOW_NECROMANCER_SUMMONS:0]
[GOOD_SQ_COUNTS:0:0:0]
[EVIL_SQ_COUNTS:0:0:0]
[PEAK_NUMBER_MIN:0]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:3]
[REGION_COUNTS:SWAMP:0:0:0]
[REGION_COUNTS:DESERT:0:0:0]
[REGION_COUNTS:FOREST:0:0:0]
[REGION_COUNTS:MOUNTAINS:0:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:0:0:0]
[REGION_COUNTS:HILLS:0:0:0]
[EROSION_CYCLE_COUNT:1000]
[RIVER_MINS:0:0]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:0]
[SUBREGION_MAX:5000]
[CAVERN_LAYER_COUNT:1]
[CAVERN_LAYER_OPENNESS_MIN:100]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:0]
[CAVERN_LAYER_WATER_MIN:15]
[CAVERN_LAYER_WATER_MAX:15]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:1]
[LEVELS_ABOVE_GROUND:8]
[LEVELS_ABOVE_LAYER_1:10]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
[LEVELS_ABOVE_LAYER_4:1]
[LEVELS_ABOVE_LAYER_5:2]
[LEVELS_AT_BOTTOM:1]
[CAVE_MIN_SIZE:1]
[CAVE_MAX_SIZE:1]
[MOUNTAIN_CAVE_MIN:0]
[NON_MOUNTAIN_CAVE_MIN:1]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:2]
[TOTAL_CIV_POPULATION:0]
[SITE_CAP:0]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:0:0:0]
[RAIN_RANGES:0:0:0]
[DRAINAGE_RANGES:0:0:0]
[SAVAGERY_RANGES:0:0:0]
[VOLCANISM_RANGES:0:0:0]
[PS_VL:100:100:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:100:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_SV:0:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:0:0:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
embarkprospectBase materials:
STONE : 80168
FEATURE : 12499
MINERAL : 52698
FROZEN_LIQUID : 18432
MAGMA : 22900
TREE : 572
MUSHROOM : 1959
Liquids:
WATER : 1242 Z: 126
MAGMA : 22548 Z: 119..123
Layer materials:
CHALK : 16231 Z: 136..138
SCHIST : 29823 Z: 130..135
PHYLLITE : 26069 Z: 123..129
DIORITE : 8045 Z: 119..122
SLADE : 11941 Z: 112..114
>>> TOTAL = 92109
Ores:
TETRAHEDRITE : 7220 Z: 119..138
SPHALERITE : 5088 Z: 123..135
MAGNETITE : 1359 Z: 136..137
LIMONITE : 964 Z: 136..138
RAW_ADAMANTINE : 558 Z: 117..123
NATIVE_PLATINUM : 186 Z: 136..138
HEMATITE : 182 Z: 137
NATIVE_GOLD : 33 Z: 136..138
CASSITERITE : 16 Z: 137..138
>>> TOTAL = 15606
Gems:
CRYSTAL_ROCK : 170 Z: 120..138
MORION : 154 Z: 119..138
MILK QUARTZ : 145 Z: 119..138
RED TOURMALINE : 135 Z: 123..135
QUARTZ_ROSE : 117 Z: 120..138
RED PYROPE : 103 Z: 123..134
CITRINE : 87 Z: 120..138
PYRITE : 84 Z: 121..136
AMETHYST : 82 Z: 119..138
PRASE : 80 Z: 119..135
TANZANITE : 77 Z: 123..135
SMOKY QUARTZ : 72 Z: 119..138
MOONSTONE : 63 Z: 123..135
GREEN TOURMALINE : 60 Z: 123..138
SCHORL : 55 Z: 126..135
RHODOLITE : 54 Z: 123..130
YELLOW SPESSARTINE : 50 Z: 126..134
PINK GARNET : 49 Z: 123..135
BLUE GARNET : 49 Z: 123..135
PINK JADE : 48 Z: 136..138
INDIGO TOURMALINE : 47 Z: 123..138
BLACK PYROPE : 47 Z: 124..135
MOSS OPAL : 46 Z: 131..135
VIOLET SPESSARTINE : 44 Z: 123..129
TURQUOISE : 40 Z: 137..138
EMERALD : 38 Z: 130..135
PINK TOURMALINE : 35 Z: 123..138
CARNELIAN : 35 Z: 136..137
GOSHENITE : 35 Z: 131..135
WOOD OPAL : 33 Z: 119..137
CLEAR GARNET : 29 Z: 123..135
AQUAMARINE : 28 Z: 133..135
GOLDEN BERYL : 28 Z: 130..135
CLEAR TOURMALINE : 28 Z: 131..138
OPAL_REDFLASH : 26 Z: 131..135
CHRYSOPRASE : 25 Z: 136..138
ONYX : 25 Z: 136..138
WAX OPAL : 23 Z: 123..127
JELLY OPAL : 21 Z: 119..121
OPAL_PINFIRE : 21 Z: 132..135
GREEN JADE : 19 Z: 136..138
OPAL_PFIRE : 19 Z: 130..135
TIGEREYE : 18 Z: 136..137
WHITE JADE : 17 Z: 136..138
DENDRITIC AGATE : 17 Z: 136..138
SARDONYX : 14 Z: 137..138
BLOODSTONE : 13 Z: 136..138
LAPIS LAZULI : 13 Z: 120..121
TUBE AGATE : 12 Z: 137..138
BLUE JADE : 12 Z: 138
CAT'S EYE : 12 Z: 132..133
YELLOW JASPER : 10 Z: 136..138
CHRYSOBERYL : 9 Z: 131..132
RUBY : 9 Z: 137
PICTURE JASPER : 8 Z: 138
BROWN JASPER : 8 Z: 136..138
ONYX OPAL : 8 Z: 122
PIPE OPAL : 7 Z: 135
SAPPHIRE : 7 Z: 137
ALEXANDRITE : 5 Z: 131
LAVENDER JADE : 4 Z: 136
>>> TOTAL = 2629
Other vein stone:
MICA : 14170 Z: 123..135
MICROCLINE : 14058 Z: 119..136
KAOLINITE : 2530 Z: 137..138
GYPSUM : 1284 Z: 136..137
JET : 1229 Z: 136..138
BAUXITE : 644 Z: 137
LIGNITE : 569 Z: 136..138
COAL_BITUMINOUS : 394 Z: 136..138
RUTILE : 63 Z: 123..134
GRAPHITE : 17 Z: 131..134
PETRIFIED_WOOD : 16 Z: 136..137
SALTPETER : 16 Z: 136..138
ALABASTER : 9 Z: 137
ANHYDRITE : 7 Z: 136..137
BORAX : 6 Z: 136
SELENITE : 5 Z: 137
MARCASITE : 2 Z: 138
SATINSPAR : 2 Z: 136
>>> TOTAL = 35021
Shrubs:
MUSHROOM_HELMET_PLUMP : 36 Z: 126..129
GRASS_TAIL_PIG : 35 Z: 126..129
POD_SWEET : 35 Z: 126..129
GRASS_WHEAT_CAVE : 34 Z: 126..129
BUSH_QUARRY : 27 Z: 126..129
MUSHROOM_CUP_DIMPLE : 27 Z: 126..129
>>> TOTAL = 194
Wood in trees:
BLACK_CAP : 32 Z: 126..129
FUNGIWOOD : 29 Z: 126..128
TOWER_CAP : 25 Z: 126..129
GOBLIN_CAP : 24 Z: 126..129
TUNNEL_TUBE : 23 Z: 126..129
BLOOD_THORN : 23 Z: 126..129
>>> TOTAL = 156
Has HFS tubes : 16 Z: 117..119
If you're looking for a goal, using magma to heat the surface enough to build above ground might be challenging.