David Brenion/Nifty Balloons has an excellent tutorial package called Backpacks for 35.00 dollars available here,
Designs included in this video package:
8.Advanced Jet Pack
I have already made the Wings and Jet Pack and I found the Ladybug to be the easiest so far. My daughter loves it. I even made her a ladybug bracelet to match.
To learn how to make the bracelet, Holly Hopper has a really cool tutorial on YouTube from which I learned, http://www.youtube.com/watch?v=eXTT5LUZkCQ. To make it a bracelet, all you do is take a 260 and tie it to the legs.
Below are pictures of my replication.