Cluster stitches are created by working multiple unfinished stitches - double crochets, treble crochets, or other crochet stitches - and then joining them all at the top in the last step. For complete in-depth instructions with more information, you're invited to take a look at our cluster stitch video tutorial, posted at the video.about.com website.
Want to learn how to crochet other types of stitches? We've posted free instructions for all kinds of different crochet stitches right here on our website. You can easily learn the basic stitches, shell stitches, tunisian crochet stitches, and many others - for free!
If you'd rather work from a printed book of stitches rather than a web page, you might be interested in taking a look at the Triple play pattern stitches book by Darla Sims, published by Leisure Arts. It's an inspiring collection of crochet stitches that I really enjoy owning. Perhaps you'd like it, too.