I always save the pictures my boys make from finger painting. I love the way they look after they dry - even if they use only one color it looks dark in some spots lighter in others (I'm sure theire is a fancy art word for this). I usually cut out shapes - hearts, cross, etc. to make seasonal cards/projects from the finger-painted pictures.
Here is what we did for Valetine's Day.
The boys were VERY excited to glue the crayons to the canavs and blow dry the crayons. They couldn't believe the crayons were melting.