Finger Painting - Tape on Canvas, Let Them at it, Remove Tape! let the kids use brushes/paint; this would also be great for a play group craft.the parents can pick the colors they like and even the words b/c all the kids will care about is painting.
I love the idea of this! Play Create Explore: Baby Oil Sensory Bags = baby oil, food colouring, a little bit of water, glitter, objects to find (smooth). Put in ziplock bag and duct tape for leaks and little fingers who would like to open it.