Paper plates, Popsicle sticks, and a balloon are all you need to play Balloon Ping-Pong. (Not sure how sturdy the paper plates would be, but may be able to do something similar for a carnival/game night social event theme.
Classic Sawhorse Ive found a sturdy sawhorse thats great even if you have limited space. When Im done working with them I just stack them on top of each other and store them out of the way. Heres all it takes to build one horse: One 26 fo