DIY cupcake stands - so colorful! Get plastic wine glasses from the dollar store, fill the bottom with M&M's (or color coordinating candies) and put the cupcakes on top. I have glass sundae cups I could use. Fun way to serve cupcakes.
Turning on the TV and/or video games isn't your only option for keeping a group of teens occupied. These indoor teen party games are a hit with both teen boys and teen girls and they're not expensive or time-consuming to set up.