We used some old pillowcases for sack races in the backyard. We did several heats since the kids were much faster than I thought! We also played "musical pillows", which is just like musical chairs except you jump on a pillow when the music stops.
For parents and teachers alike. Does your school have pajama day? Make it funnier with a game of Pajama BINGO. Modify it for the season/time of year. This one was made for Christmas time. Make it a classroom getting-to-know-you activity and have the students go around the room and write the name of their fellow classmate in each square.