I finished knitting this blanket recently. I used cotton yarn (Peaches and Cream) and I just love it! It is so soft... and heavy, but not smothering. I may never go back to acrylic worsted weight yarn again, at least not for afghans. I found the cotton yarn at a good price winter-before-last (on 1-pound cones) and I've really been enjoying working with it. I have 2 other blankets going... one in strawberry-pink-and-white and the other in mint green, peach, and cream.
This particular pattern was fun to work up. The "plaid" squares were a result of using varigated yarn, not anything special I did. I can't figure out why the pattern is wider on some squares than others, though.