Yvan Arpa's coprolite watch is a US$11,290 timepiece with a face made from fossil dinosaur turds and a band made from black cane-toad skin (normally poisonous, rendered inert through processing).
The thing is, coprolites just aren't that valuable. Dinosaurs left behind a lot of crap. This site sells coprolite at $8 per pound (it makes a wicked gift!).