Pin the Something on Something
Traditionally pin the tail on the donkey, this game can be changed to fit any theme. In this game, blindfolded guests try to stick a paper 'tail' onto a poster of a donkey. You can take a piece of poster board and draw anything with something missing - a nose on a clown or animal, the TY heart on a beanie baby, a spaceship in an outer space scene, and one year we gave Yoda (Star Wars) his staff. Just be sure to include an outline of where the object needs to land.
Bean Bag Toss
You can make an easy Bean Bag Toss using a double layer of poster board glued together and a large box. Use the large box as a base, and attach the poster board to one side of it. Before attaching the poster board, paint a design on it, allowing for one or more holes. We never kept score, but the kids had a lot of fun throwing those bean bags. One year we even gave bean bags as party favors - they're easy to make from fabric scraps if you sew.
If your not creative go to the dollar store and substitue plastic golf balls, instead of bean bags and an old sheet with holes cut in it hanging from the clothesline. Be sure to hold down the bottom edge with something heavy.
Freeze
Begin by playing music, everyone moves and dances until the music stops then they must "freeze" in whatever position they happen to be in.
Balloon Bust Relay
Purchase large balloons, stuff with a prize such as a whistle, then inflate and tie. You will need one balloon for each guest. Divide children into two teams and place each team behind the start line. At the other end of the room are the balloons. On your mark a child from each team runs to the other end of the room, grabs a balloon and sits on it, bounces on it, lays on it, anything they can do to make it pop.
When the balloon pops they collect their prize and run back to their teammates. The game continues until every child has retrieved their prize. If one team falls behind parents are allowed to help:D Make sure you've got the movie camera rolling, you won't want to miss the action or the expressions. If you don't have time for a relay yell, "GO" and let every child grab a balloon at the same time and try to pop it.
Make sure to carefully clean up the balloon remains, as they are choke hazards for young children.