Jeni Baker's got a great laundry bag solution, the lined drawstring bag. The pattern has directions for eight different sizes. It has a myriad of uses.
Recently, Pink Castle Fabrics's owner, Brenda (who blogs at Just a Bit Frayed), whipped up a few lined drawstring bags for her family's summer travels. I especially like the one with the koalas on the beach!
She has also put together a kit for making that adorable Little Red Riding Hood bag. Using these darling fabrics by Tasha Noel, and a coordinating red dot, it also includes the full pattern.