When the minis tried bouncy ball painting the first time, we were a tad disappointed that they didn't bounce with paint on them. Enter bouncy ball painting round 2. This time around I had the kids put lots of paint on the bouncy balls, throw each ball into the box (on the paper) and then I helped them move the box around so the bouncy balls rolled back and forth.
The result was a totally different effect than round 1:
Results of Round 1
Results of Round 2
We had a very decorative box at the end!