cupsanddowns is a game where one team tries to turn all the cups upside down and the other team tries to turn them right side up. At the end of the time, whoever has the most their way wins. Simple, inexpensive game that could bring a lot of energy.
You only have 3 items per team so after the three people go, the next people go and move one of their items to a new place. Lots of creative ways to switch this up: create obstacles, 3 legged races, crab walk over to it, etc.
Shoebox lid & craft sticks- these are wide ones, and low temp glue gun. Endless fun and all you need is a shoe box lid and Popsicle sticks! Build a marble run or "Plinko" with all kinds of different creative designs via Frugal Fun For Boys
DIY: Modern Colorful Mobiles via Project Wedding. I love the idea of using different shades of white vellum to make these paper mobiles for a wedding reception. I am off to the paper store to see what is available.