I've seen this done on a bunch of different blogs so we decided to try it yesterday! It worked out great. I took a piece of contact paper, cut out a egg shape and taped it down (face up) on the work space. I set out different materials. Pom Poms, Feathers, Tissue paper, Sequins, Felt, Etc. I told him to stick on whatever he felt like sticking on and that's it. I then sandwiched all the stuff in with another square of contact paper, then trimmed around it. We hung it up in the window when we were done.
2 weeks ago