Here are a few links. The first two are the same pattern with variations. The third is to a website where you can buy a pattern that comes with both round and rectangular carriers.
http://www.thriftyfun.com/tf67611681.tip.html
http://www.quiltingboard.com/t-17114-1.htm
http://www.sewbaby.com/shopbaby/prod...oducts_id=4018