Skip Counting by 6 and Can be used as an outdoor activity where students have to jump, leap, hop, skip etc. through hoops laid on the floor. Students/teacher can write in chalk the starting number on the ground.
Clothespin Math on a clothes hanger! LOVE this. Easy to make, and self explanatory. I'm thinking a wire clothes hanger would work better, so the clothes pins are easy to slide back and forth (almost like an abacus).