This has got to be the coolest, easiest craft ever! Foil over dried, raised glue and wiped down with shoe polish. Easy enough for kids to do. Try printing out a wise saying, or their names in a fancy-smancy print. Low-cost art form.
Make It... a Wonderful Life: Owls, Foil, Glue, and Shoe Polish DIY art. Draw on cardboard, draw over lines with thick tacky glue and let dry, wrap in aluminum foil using cotton swab up against glue outlines once foil is down to make sure lines show up well, draw variety of patterns in all open spaces with dull pencil, then rub entire thing with black show polish and wipe off