This is probably my favorite afghan so far. It was a really quick and easy pattern.
I did tweak the first corner of each round "Ch 3, dc 1 in corner hole" and then finish the round as if this were the entire corner, when you reach the end of the round you won't have to slip stitch instead "dc 2 in corner hole, ch 2, sl st in the 3rd ch from the beg." just as you would with a granny square, this also makes it so you can't see the slip stitches in the final product. Although the first corner hole will be a slightly different shape. (in the 2nd picture, in the bottom right you may notice that those holes are a little bigger) Note: this is a 12in square
http://www.youtube.com/watch?v=v_0L152d1oc&p=C8B6ACC17E98D42C (also not my own pattern) I hope you enjoy!