You want a toe? I can get you a toe, believe me. There are ways, Dude. You don't wanna know about it, believe me.
Hell, I can get you a toe by 3 o'clock this afternoon... with nail polish. These ****ing amateurs...
Yes, I have. I did the Professor character from "House of 1000 Corpses" and his costume was adorned with bones. I had a box of various animal bones that I used. I'm sure a professional casting would look pretty good, but nothing from local costume shops looked real enough. Plus, a resin cast would be much heavier. Dried bones are very light weight.
I knew a guy who went to concerts with a necklace made of chicken bones around his neck (ahh, black metal concerts) - just make sure you do something to completely dry/bake/rot them out before you use any of them, otherwise you'll be with him in the box of "dude smells like rotting KFC", which in the black metal world, is a possible plus (maybe?) but may not quite be what you want.
I remember I was going to a halloween party in college once and I was going as a witch doctor. I scraped some old costume stuff together but REALLY wanted to sew bones to a tophat I had but there was neither time nor the budget for going to buy them at a halloween store. And so at dinner that evening I noticed chicken wings were available and well....I had a lovely dinner of mediocre dinning hall chicken wings, kept the bones, scrubbed the **** out of them back in my dorm and the rest was history.