My 3 year old nursery kids made these for their dad& for Father& Day. We used crayons and stickers. The dads liked them, but the kids really liked them. :) I& not sure if the dads actually got them off of the kids to be able to wear them.
Group Art Activity, "Tennis Ball Painting" (from Art & Creativity in Early Childhood Education) Another great example of play fostering socio-emotional development! In fact, many group activities will do so.