any mod creators out there?

i cant make mods, and there is no way i could learn lol. but there is something i think would be a cool mod, if its even possible (it probalby isnt)
would it be possible to change the form the sims take as werewolves? like make a new model for it?

also, is it possible to make a skin for a horse so it look like another animal? might be cool to have a big lizard or something for sci fi stories.