I think this is a wonderful craft project. Not only is ot easy to make, but this will teach the boys to recycle.
PHOTO COASTER
A fun craft which makes use of unwanted CDs, these photo coasters are a brilliant gift idea for all occasions!
You will need:
Unwanted CD, CD-Rom or DVD
Large photo
PVA glue (white glue)
Pens
Acrylic varnish (optional)
Print out a photo onto standard printer paper large enough to cover your disc. Glue the photo to the disc (the side with the picture or writing on) making sure the central image is in the centre of the disc.
When dry trim to size and add a message with the pens.
To seal, paint over the image and the edges with PVA glue and leave to dry. Repeat. If you wish you can make your coaster extra-hardwearing by using acrylic varnish rather than PVA glue.
source: http://www.activityvillage.co.uk/photo_coaster.htm