While there's not a lot targeted at teen librarians, there are a tons of good craft websites on the net, some general and some specifically teen geared. Here's some of my favorite to sift through:
-Instructables - How to make cool DIY project. Instructions on how to make almost anything you can think of and lots that you never would. Some of it is pretty impractical for most library programs, i.e. too complicated and expensive.
-Not Martha - Not the sort of projects Martha Stewart would generally make. Not a ton of stuff, but fun, and has good links. Someday I will knit myself this wig.
-Cut Out + Keep - Sort of like a less tech heavy version of Instructables. Slightly more practical for library programs. Sadly, not all the projects actually have instructions. If you work with teens that sew, there's a good variety here to choose from
- Craftster - Crafting Community & Forums: Crafts, Patterns, Projects & Craft Ideas. Less instructions than I'd like, but lots of cool things to look at.
- Diary of a Crafty Chica - Blog and website with some really cool stuff. Some of it is way more complex than I'd get into with my teens, but there's some workable/adaptable ideas. She's also got a line of books and craft supplies. I really like her Crafty Diva books, and have used them with my teens.
Next time, some crafts and a book list.