We have only played with shaving cream a few times, and each time I am amazed at where I find the shaving cream when we are finished (on the dog?). The mess is so worth 30 minutes of playing, and the squeals of laughter.
I put green washable paint in some shaving cream and let the kids play.
After they were finished
making a mess playing, we placed some shamrocks, printed on cardstock, on top of the shaving cream. We ended up with marble looking shamrocks.
Note to self: Do not leave the camera on the table when kids are doing a messy art project.