I've been taking a Tunsian Crochet class at www.craftsy.comThe first projects are these squares which are supposed to be washclothes but that I will make into an afghan. They teach 3 different stitches.
This is a 3 color one, although the blue and blue green are close in value. The limiting factor was the yarn available at Joanne's. It's a bamboo acrylic blend and nice to work with. The nice thing about this is getting color and only having to weave in the ends at the beginning and end. Cool technique.
The Craftsy courses have been good. They have a free Block of the Month class to give you the idea of how they work and if they will work for you.