Everyone from Avril Lavigne to Matthew McConaughey jumping on the "design your own clothing line" bandwagon!

Avril's line, Abbey Dawn, reflects the singer's "signature skater-girl-chic style" and includes bright-colored hoodies, jeans, and tees in skull and zebra patterns, Us Weekly reports. (FYI -- Abbey Dawn is Avril's dad's nickname for her.) "It's rock glam: fun, colorful, young and edgy," Avril says. "Everything is fit to be sexy and flattering."

Meanwhile, Matthew, who's rarely seen wearing a shirt (for good reason!), has created a line of swim apparel under the name j.k. livin, named for his production company and personal mantra, "Just keep livin'" (which was of his lines in Dazed and Confused). The line will include t-shirts, swimsuits, Frisbees, and more. Sounds like something Matt needed as a kid -- in a recent interview with Playboy, he revealed, "My mom didn't even put a bathing suit on us at the country club until we were 9." Yowza!

(On a related note, congrats to 21-year-old Christian Siriano, this season's Project Runway winner!)