I bought a large exercise ball when I was pregnant with Trip. It was a great seat when I was uncomfortable and then got deflated sometime after Trip was born since we didn't really have room for it. Since then, it has been in a box since we moved last summer. Knowing how much Trip likes balls, I figured that B week was the time to finally pull it back out.
I made a B on it with masking tape and presented it to him. He was quite impressed. The tape B didn't last long (which I expected), but it made its point and we had fun playing with such a large ball. Unfortunately, I was too busy keeping Trip safe that I didn't get any pictures of the fun. He liked lying on it and rolling it around. He also loved me bouncing it to him and it bouncing on him arms, legs, or whole body. He wanted to do that again and again!