I would use 2-3 layers max, and have pre-punched shapes that they can glue on. Like circles or squares...
I have some easy ones on my blog that I just posted (you don't have to use the brads or ribbon--simplify mine a bit more). I stamped snowflakes on the background, and then the focal image. Take
a look if you'd like. I didn't used punches for mine, but it's a good idea for the tots.