The very bottom z-level of every fort I make is reserved for burial detail...
There's a giant room which is reserved for wastes of space like immigrants that I immediately killed off (normally because they like cats for their aloofness
) or dwarves that came as part of a goblin raid. These dwarves are put in plain stone coffins in that mass graveyard.
Normal civilians who die are put in wooden coffins in another mass graveyard on the opposite side of the corridor.
None of the above are ever assigned burial chambers or coffins so on occasion mistakes will be made and they'll be buried in the wrong area...
Soldiers get a 3x3 burial chamber with a green glass coffin.
Nobles get whatever size burial chamber will keep the twat happy, with a clear glass coffin.
Legendary dwarves (including legendary soldiers, though they're very much a rarity in my forts) get a 5x5 burial chamber with an iron coffin.
That's fairly standard for me. Depending on what I've got available, I may choose to have coffins made out of other metals I have in abundance like copper and give them to the soldiers and give green glass to civvies
As for trophies, having a goblin siege party walk through a corridor lined on either side with the skulls (totems) of their unsuccessful predecessors is a rather evil prospect...it's not really morale-shattering but in my head that's basically what it's doing. Their armour and weapons (except whips) are melted down and turned into armour and bolts for my military dwarves and bones turned into crossbows and training bolts, which is to further torment future raiding parties. I can just picture a dwarf crippling a goblin then walking up and saying "Like my crossbow? I made it out of your brother's bones, and the bolts out of his armour" before delivering the killing blow
Whips are used to line the boundaries of my arena. The goblins can either stay in the middle of the arena and get killed by my dwarves or a megabeast or whatever...or they can run to the walls and slowly be whipped to death for their cowardice