DIY Balloon garland - much easier and cheaper than buying those specialty arches or helium (these colors are right on, too!)
Spider web game. This would be great for a Spiderman party. Just use painter's tape to make the web and have the kids throw wads of paper at it to see if they can get it to stick.
It's called a "Punch Box" and it's a great alternative to a pinata. (Four-year-olds with big sticks can be a little scary sometimes.) Instead of beating on a pinata with a stick, each child punches through one of the pretty colored circles in order to grab the prize inside.
Cute way to serve chips at a cookout. Use scalloped scissors to cut top off brown paper bag and embellish with rubber stamp. Like it!