I love this! totally going to use it for Art Week a the zoo! Creating fall leaf pictures is a classic craft activity that can be enjoyed by all ages. You'll find this lovely example and others at Atelier Pour Enfants.
Spray paint pine cones to have that mercury glass look to them. Use Krylon Looking Glass Mirror-Like Paint on pinecones, add a little fresh or faux greenery. I like the idea of spray painting the pine cones.even for other décor ideas!