I have been to Willow Creek Church many times and each time I go I see something new. During my last visit, I saw this prayer wall in one of the kids rooms. I thought it was a great visual for kids to see their prayers represented on the different colored papers. They took time in their small groups to think of something to pray for, write it down, and put their paper on the wall.
It looked like it would be fairly easy to make and lightweight to move as needed.