I found this free patter on this blog http://www.gather.com/viewArticle.action?articleId=281474976910272. It works up really fast and is very easy to do! It creates a lighter, more airy afghan so I would consider it a mid-weight. I had some yarn left over from when my boys were babies and a lady at work was expecting so I whipped this up for yer in a couple days. I think I did the edging a bit different than described in the pattern above but it works for me!
Round afghans are very pretty and just something different than your normal square or rectangle blankets.