spray paint measuring tape and keep track of kids heights at different ages. Takes up no space and can move with you. I would paint the back side to mark so you can still see their height without having to remeasure your measuring tape.
"No-more Monster Spray"- cut out funny monster picks and glue on spray bottle. fill with water (can add a few drops of essential oil to make smell nice), then spray where kids are afraid monsters might live! so smart!