Long name, simple idea. If you've making a granny squares blanket with a whole lot of yarn and a few colors per square, chances are you're having some trouble trying to make it look random.
I present to you a randomizer for granny squares that attempts to spread out your yarn colors and weights. Give it a whirl and let me know what you think.
Update: The pattern generator now has its own site! Bear with me through the ugly design while I revamp things and get some new features in, including the ability to reload blankets you've made before and to print blankets in a useful way.