If you do any face painting, Butterflies, rainbows are big.
Paperbag- get a small brown lunch size bag. if you hold it at the top on one side and snap you fingers while holding the bag it sounds like some thing hit it. What make this work is, your eye contact and follow through with body movements, but practice throwing an invisible ball then catching it in the bag, you can pass an invisible ball to each girl and have them toss it, Play it up big -like "Oh you threw that one to far go get it and wait for her to get. It not hard but you need to practice to get your timing down.
Do you do any magic? I usually do. I've got a change bag and a silk cylinder. I use the cylinder for give aways [party favors] bracelets, candy. etc. If you provide party favor besure to include this in the cost of your party. A thumb tip is great for all kinds of simple magic.
You can also make balloon hats.
Out side rocket balloon, a version of musical chairs or hot potato with a water balloon.
There all kind of games with small balloons if there is room, do different types of relays like must pass balloon down the line keeping it under your chin and you can not use your hands,
run and bust a balloon, tag next in line ect. Sorry so long, but hopes this helps
