I recently stumbled upon the concept of Junk or Junque Journaling.
Basic concept: Fill your sketchbook with random "junk", the more the better!
The themes for junk journals are endless. Some make collage book about special memories, or things they dream about. For others it's all about total destructions with topics like "Place sticky things here". if you need ideas to keep you going you might be interested in the sketchbook Wreck this Journal. I think this book would be a great way for young artist to explore new ideas and mediums. I think I'm going to get one myself and make it a group activity with my future foster kids. Yes, if you don't read my ittybittybirdy blog - my husband and I are going to be foster parents soon! If you are not into journals or don't think your are an artist try to think about your own scrap-booking and how random "junk" might transform it.
Click on the images for the sources to these great examples
and to see more of their amazing work :D