I love love love this. I wanna blow it up and frame it for our living room. Your thumbprint + your partner's thumbprint. Your children's thumbprints. Both your thumbprints. However you want to do it, just do it, it's so simple and lovely.
How To Make Flubber, Glurch and Other Homemade Art Supplies at Home: There's a whole world of art supplies you can make in your own kitchen - some I've never even heard of like flubber, glurch, gak and oobleck.