We are doing a dinosaur unit for science right now and of course the kids are loving it!
I tried this dinosaur skeleton craft I found the idea for at The Do It Yourself Mom. Ahead of time, I used a white crayon and traced a skeleton from our dinosaur encyclopedia onto watercolour paper. The kids were so surprised when they started painting and discovered dinosaur bones on their paper!
I was surprised how well the crayon held out against letting the paper absorb the paint. This was a great project for the kids- even my 2 year old.