Roll on this list if you're scavenging through a battlefield, just killed some evil empire mooks, or maybe if your character starts as a generic soldier- this is what they got under their foot.
For a bandit/militia- Roll 1d20
For a blackguard/elite- Roll 1d20+30
For a real bloodthirsty bastard- Roll 1d10+30
For any old soldier- Roll 1d50
 A rock.
 Old bandage trimmings.
 Dried blood.
 Some flower petals- meant to prevent foot fungus.
 Some dead maggots.
 The severed foot.
 Some copper coins.
 Some gremlins.
 Tufts of grass to act as poor padding.
 A hole.
 Old tooth.
 Wooden dowel used for bandages (or toilet paper)
 Bit of nasty water.
 Bit of slime and shed skin- probably trenchfoot. Gross.
 Bit of slime from a slime- slashed apart. No longer acidic in this state.
 Knuckle bones
 Lock of a prostitute's hair.
 Tiny bag of grain, hidden from his fellows.
 Pet mouse.
 Crude drawing of the face of his superior officer.
 The minimum age required to enlist- written on a tiny slip of paper.
 Note for an extra meal at the commissary.
 Fake gold coin.
 Deck of playing cards.
 Pouch of salt.
 Some dead gremlins.
 Note written by another soldier as an IOU for a day of shore leave.
 An arrowhead.
 An extra sole.
 Feathers; for fletching arrows in the field
 A knife.
 Note announcing a denial for promotion.
 The leather face of a person, tread on in hatred.
 Tarot Cards
 Dead songbird, wrapped in soiled bandages
 Voodoo doll- uniform as the enemy
 Fresh blood.
 Doll's dress.
 Bloody rag.
 An extra soul.
 Some herbs; helps with the smell.
 Map of the local area. There's an X marked with "weapon cache"
 Pouch of spices.
 Bloody handkerchief.
 Tiny hand mirror.
 Some silver coins.
 Perfumed love letter