Market bags are easy and creating your own pattern is fun. I use cotton yarn because it does not stretch as much as some acrylic, worsted yarn.
Simply make a magic circle then crocheted 16 half-double crocheted stitches inside it. Make as many rounds for the circular base as you want then build up the sides in any stitch you choose. Add any type of handle you want. And volia..cheap, beautiful, useful gifts that work up in a couple of hours. Next batch, I will choose bright coloured cotton yarn
some patterns http://www.ravelry.com/patterns/library/the-adelaide-market-bag