This is a section of a Christmas gift I made for my brother. I used the Never Ending Granny Afghan pattern by Michael Sellick.
Normally with granny squares you do one round and then change to a new ball of wool. I do not know about you, but I hate sewing all those ends in.
Take another look at the picture. Do you see that I have used five balls of wool? Can you see that instead of a square the pattern is going in spirals?
What happens is that after you do one round, you turn the afghan back to the start and pick up on the next colour. It is very quick and easy.
If you like videos there is a link from the free ebook to a video tutorial.