I honestly can't remember where I saw this idea, but it is awesome! I bought 2 shower curtains from Dollar Tree and traced circles on both. On one I added numerals 1 - 20 and the other letters A-Z. I've used these for many games. With Hassana, we are basically identifying numbers and letters, so she finds them and jumps on them. With Amir and Yasina, we've practiced our spelling lists and drilled math facts. The children are always happy when I pull theses out!