I found this great chart
on pinterest a couple of weeks ago. You can find it here on WordPress http://lemondedesucrette.wordpress.com/2010/10/13/about-ponchos-and-pattern-d/
I have since made 2 ponchos as birthday presents for my daughter’s friends. It works up very quickly and you can adjust it to any size. I even made a matching doll poncho for one of the little girls (seen in the first picture below).
I added this crochet pom-pom trim to the second one. I found the pattern for that on Moogly (another great blog site that offers lots of free patterns).
Here’s a link to the pom-pom border http://onceuponapinkmoon.blogspot.com.au/2013/09/pom-pom-edge.html?m=1
I am sure that I will be making more of these. They worked up quickly and turned out beautifully!