Here is a king sized snowball quilt that I did. Only the top is finished. It was a gift to my mother in law but she passed away before I was able to complete the quilt, but she did get to see the top after it was all finished and she really liked it.
I couldn't tell you how much fabric it took to make it. Because originally I bought 2 yards of fabric and ended up going back to get more, but for the main blocks, I am thinking it was probably 5 yards, but not too sure.
http://www.quiltingboard.com/t-92570-1.htm#2321251