I'm pretty sure that just about everyone is pretty chilly to downright cold right now. That being said, knitting or crocheting a blanket seems like the perfect project. This crochet block stitch border pattern from the book Crochet Blankets: Complete.
Basketweave is a popular stitch pattern that relies on double crochet front and back post stitches. It requires a multiple of 6 stitches, plus 4 more stitches. For a washcloth-sized swatch, start with 42 stitches.