Let's face it, knitting and being a badass don't go hand in hand...necessarily. But take a look at Knockdown Knits: 30 Projects from the Roller Derby Track ($14) and you'll see how well the two work together. Patterns in the book include arm slings and crutch covers, but also flirty skirts and sassy leg warmers (for those of you who aren't taking spills on the track every week). Seems like a good combo to us, but we'll caution you against knitting on skates. That's a recipe for disaster.