What will those gnomes do gnext?

Moms who are following the adventures of our mischievous math gnomes might want to buy a simple wooden tray(mine is 10 1/2 X 14 inside the frame) and some felt in rainbow colors and make a rainbow tray this weekend. I used stiffened peel-and-stick felt and stuck it right to the tray in two inch increments. The tray and the felt were at my local Michael's craft store.