Well... basing it off of terraria.

I'd really like some banners. Statues sound pretty cool.
Maybe if each baddy drops a certain "spoil", and you have to collect a certain amount to trade with an npc.

Like, 1000 bandit scarfs... idk or 1000 lizardon eyes. (Maybe lizardon scales, so it doesn't seem too graphic for a 9+ game)

But yeah, it'd be pretty cool. I've always wanted some helmets/collectibles off of all types of baddies.