I've made two of these blankets in the past week. The first photo is made with Bernat Baby Coordinates in white, holding two strands of yarn together and using a K hook. This baby blanket turned out heavier, like I wanted, and is still very soft.
The second photo is of the same pattern but made with Red Heart worsted weight yarn in white using a K hook. It turned out nice too, but I really like the one I made with the Bernat Baby Coordinates better.
This is a free pattern called Beth's Little Star Afghan and can be found here http://www.angelfire.com/va3/heartfeltangels/littlestarafghan.html