I set those children to work...inspired by the Kids Craft Newletter http://http://kidscraftweekly.com/simple_cards_issue.html. We bought a pack of craft felt on Ebay and it is really gorgeous stuff. I cut and stuck the tree shapes, then T decorated them with shapes we already had in the craft box. This was the first batch, I was mean enought to make him do it all again! I really like the simplicity of these and the brightness!
Then little sister had a go, her cards were made with some craft punches. One has a label shape and then we have a small Christmas tree shape and lots of pearlescent white glitter. She enjoyed using the craft punch, we used it on sugar paper and then on some of her gold and red finger paintings.