Cole can paint pine ones for Xmas tree ornaments! Scissors and Spice: Scissors Craft: Pinecone Decoration Ideas for Christmas. And how to use up your pine cones and entertain kids at the same time - kids love paint!
Original suggestion is "nail polish + recycled lightbulbs for garden art." I think they'd make cute Christmas ornaments, and there has to be better paint and glazes than nail polish, with its tiny brushes.