Hmm, if you store the zombies in differen environs maybe they will "poke-evolve" into new forms? A zombie in ordinary conditions turn into a skeleton and if its stored in salt or a smoke hut it becomes a mummy (smoke house can also add extra abilites, add liquid smoke for STR bonus, juniper for that wild +DEX or sandalwood for a bit of CHA). Store it as a medical school teaching aid and it will develop an INT score, and if its an exhibition in the museum or library it can be WIS