Sharon Dreyfuss, the designer of the Dumpling Bag, has a free felted bag pattern on her blog. Its a very cute bag called "Bunnies Got Back." It is a perfect small size for a teenager with a cute intarsia bunny tail.
The instructions are great because she goes into detail about how to do the intarisa (2 color knitting) and has step by step instructions for using double pointed needles to start the bag and work in the round.