Have you checked this book out? A first grade teacher showed me this book a few years ago and the activity she completes with it. My students LOVE it every year.
After we learn what a paleontologist is, the tools they use, and how they do their job I read this book. I hide bones (paper pieces) around the room and have them go on a fossil hunt.
Once they've all been found each student decorates a piece, just like the fabric in the book.
Working as a team, they have to fit the bones back together to create the dino. This week they made T-Rex.
Next week, they'll try to put Triceratops together.