My 4-year-old and I had fun decorating some cookies earlier this week. She vastly preferred the taste of the canned "squirty" frosting to the Royal Icing I made. Youth! Anyway, it made for nice variety when we decorated -- especially after I chilled out and let us both enjoy the festive mess.
As a side note, she did her decorating while topless, sporting a Superman cape. Wonder if that would pass muster in professional bakeries for food prep. The baker wears a hair net, but no shirt. Maybe if s/he's not otherwise hairy? Hmm.