Repurpose/reuse holiday cards

[militantmomma.livejournal.com]

Greetings! Looking for paper crafts to reuse all of the holiday cards we are receiving in the mail. Preferably child friendly, as my daughter will be out of school for two weeks (eep!) and we will be staying in a lot, but of course, I will be helping so if there are parts that are more difficult and need an adult hand. Any and all suggestions greatly appreciated!