I would love to see Legend of Zelda themed sprites for this game. Chickens into Cucoos of appropriate color. Cows into the Cows from Minish Cap Void cucoos as Bone Cucoos Horse as Epona (Already done: http://www.nexusmods.com/stardewvalley/mods/6/? ) Weapons rethemed as Zelda weapons. Bombs into LoZ bombs. Slimes as Chu Chus/Blobs Bats as Keese /Fire Keese /Ice Keese Perhaps some of the marriagable girls made into Saria, Ruto, Tetra/Zelda, Midna (Abigail?), etc. Wizard changed into Maple the Witch Stumps into LOZLTTP stumps. Rocks into LOZLTTP rocks And so on...
adding to this, mummies as redeads or gibdos; a remlit cat reskin and wolflink dog reskin; goats into ordon goats; junimos into kikwis or koroks; pigs into the pigs from windwaker; Mayor Lewis into Bo, the Mayor of Ordon village; maybe Linus into Batreaux?; Sandy as a gerudo?; ghosts into poes; skeletons into stalfos; shadow brutes into shadow beasts and krobus into a twili; dwarf into skull kid?; duggies into sandworms; serpents into Kargoroks?. I could keep going on but I'm stopping now before it gets ridiculous.
