Hm, i'll guess I am going asking for something too. This may can be tricky one...
Zoned world. Imagine something like part from large circle or perhaps from large crater. "Outer" should be very cold, inner very hot. Somewhere center of map should be mountain range. At colder side of these ranges should be frozen ocean and some landmass. Towards hotter there should be first swamp, then lots of volcanic plains. After that wastelands, ending with evil biomes at other end. Good biomes either should not exist or are somewhere with colder areas. Size of world don't matter much, as long those all fits into it.
Yes, tricky one. Probably nothing can live in there, which may mean many rejections. However I need demand quite much for zero rejections. Okay, at least no rejections because of not possible putting on civizations. Going with tough custom creature. Landscape rejections are okay because custom creatures probably won't affect it. Ah, also planning start at Dawn of Time.
In other words biomes like this, in order from edge to edge:
-Freezing wastelands. Bonus if most minerals comes from there. Another bonus if haunting.
-Frozen sea and beach. Bonus if most good biomes are with this.
-Mountain range, probably very sharp and unfriendly one. Cold too.
-Swamp and wetlands. Livable area, in theory anyway.
-Volcanic wastelands or at least zone where most volcanos are.
-Wastelands.
-Evil wastelands.
-Kittens.
Hopefully nobody goes insane with this ^^