I made little slip on wrappers to go around packs of Pop Rocks. You can get Pop Rocks at The Dollar Tree. They come in a pack of 3 for $1. I used scrapbook paper for the wrap around band (see bad phone picture below) and designed the label below to stick on top.
I've included a copy of the label below if you'd like to use it (I left my name off for you :) Click on the photo below to go to Google Docs to get it. It is a JPEG that you can size to the size you want. I made mine pretty small to fit the band.
I found an easy science experiment to do the first week of school with Pop Rocks too. I am going to tell the students that eating the Pop Rocks are "homework" because we will use them in a science experiment the first week of school (to introduce the Scientific Method). They are "homework" because I want them to be familiar with Pop Rocks before we do the experiment! Here's the experiment: