popping paint filled balloons on a canvas . put paint tape to cover the place to stencil, put paint filled balloons around canvas, pop with darts (slingshots?), let dry, use stencil to add silhouette - love it! Or do the crayon melting thing!
Old, or New Toys = New Lamp! Get a lamp, get some toys (or whatever items you want), get your hot-glue gun, and start gluing items onto the lamp! Spray paint the whole thing when finished and tada! New lamp!