This site has a bunch of fantastic DIY carnival games and activities. including this simple GUESSING BOOTH.
Ping Pong ball Nerf targets--easy to make with some weighted water bottles and ping pong balls. We definitely have the nerf guns to do this!
Boys Circus Themed Birthday Party Can Toss Game Ideas, ring toss
Use smaller points, for easier adding. Carnival Game Frisbee Toss Game in Home & Garden, Greeting Cards & Party Supply, Party Supplies
Bear scout adventure Grin and Bear IT: This site has a bunch of fantastic DIY carnival games and activities. including this simple KNOCK DOWN game. All you need are disposable cups and a cute sign!
Have the cups spell out PTA Ping pong toss carnival game can make "witches hat" with black cups
Halloween carnival game Carnival circus games - Duck pond matching game - number the bottom of ducks, get 3 tries, matching ducks wins a prize.