Just because découpage has a fancy French name shouldn't intimidate you or your kids from giving it a try. A prime example is this excellent set of drawers decorated with vintage animal bookplates by (at the time) five-year-old Henry and his mom Megan.
The few times we've undertaken a découpage project we spent hours poring over images to find just the right ones and then painstakingly placing them just so. Our projects looked fine, but Megan and Henry's proves that you really needn't overthink this stuff. Their project only took about an hour and is quite fetching. Megan let Henry pick out pictures he liked in an old book and then he painted the drawers with a layer of Mod Podge. She cut and affixed the pictures and Henry painted it one more time. Then it just had to dry. Easy-peasy!
You can see Megan's description of the project here on her blog, Robinette. She no longer has time to update it, but you might enjoy a look around her archives at her sewing and craft projects as well as her life raising her two boys, Henry and Freddy.