A mini craze has been started on crafter_oo - a fab online craft community that I recently joined. It was started by the lovely vInTaGe VioLET and a couple members have or may have a bash themselves. You can find a tutorial to make your own on the web or you can have a look at meridianariels blog for clear and easy instructions.
Here are two that I made last night. I have shaped the rest ready for a project I am working on (another one to add to the to-do list) They are no where near as good as the others, but I gave it a good go. :)