This was our fun FHE project tonight. I found the idea online somewhere--I googled ModPodge projects, cause I was in the mood to decoupage. I love that word: decoupage.
Anyway, very simple to make, and tons of fun for a three (almost four!) year old.
I couldn't find the exact site where I got the idea, but there's pretty much the same thing on a site called Skip to My Lou.
Another tip: if you don't have the glassware lying around waiting to be decoupaged, go to a thrift store, they've got all sorts of funky shapes and sizes. I got mine for 49 cents each.