Here are pics of the Magic Ball afghans I've made. A "Magic Ball" is made of small pieces of yarn scraps. I tie them together and knot, leaving a tail. Then I wind them into balls. The result of those Magic Balls has turned into afghans. For my afghans, I've used two strands of yarn - one is the Magic Ball yarn; the other a solid color from skeins. I use a size "P" hook and half-double crochet stitch throughout. I chain until that is either the length or the width of the afghan I want, then just do hdc rows until it's the size I want. I leave the yarn tails from the Magic Balls hanging out just for interest, but they can be woven in as well.
The first is one made with Red Heart Supersaver "Dark Navy" (discontinued color) as the second color:
The next one is made with Red Heart Soft White as the main color:
The last one is made with Red Heart yarn in Black:
I've started yet another one with Dark Navy. These crochet up so quickly, and it's fun to see how the colors come together. You can used planned colors too - just choose your colors and cut yarn into different lengths and tie together, the roll into a ball. As long as I have Magic Balls, I'll probably continue making afghans out of them.