Last week we were at the school supply store and I remembered reading about a geoboard in the next week's lessons when I saw one in the midst of the math supplies. I thought, "It's jut a board with some nails in it!" and put it down. Then I noticed it was ONLY $3.95 or so and figured we might use it at some point, so I added it to my pile. I didn't get the colored rubber bands because we had perfectly good rubber bands at home!
I put it with the school stuff and the next time we did school, brought it out with the lesson materials. Before I even had to say anything, my 6 year old was adding rubberbands and creating a design. Before we finished school he was fighting over it with my 4 year old. They LOVED this thing! He played with it all day, and then, get THIS: he put it under his pillow at bed time! Here is one of the designs that he created. He also took the picture! He made countless designs that day, and I bet if I look, it is still under his pillow. Here is a great resource for geoboard lessons.