Boxes are fun to incorporate into cheers that have a multi-level pyramid. Take a square box and cover with paper. Put one school letter on each side, under each other. Do this with three boxes. Build a pyramid that has at least three levels of three people, including three on the ground.
Flags are also fun to make, and neat to use.
Purchase nylon fabric that s about three or four feet long by five or six feet wide. You be the judge of how big and tall you want the flags. Buy nylon of a contrasting color and cut out your school letters. Sew or glue the letters to each flag. Punch several holes in the plastic tubing to tie the flag on.