What colors are you looking for? I made this one
http://www.quiltingboard.com/t-19936-1.htm from a kit I purchased here.
http://www.christaquilts.com/index.p...=index&cPath=3
I see she no longer has this colorway but there are some other choices. Also check out the fat quarter bundles, there may be something there you like. And no, I'm not affiliated with this shop. :-D
I don't think 5 colors would be enough for this quilt, you'd end up with really large areas of the same color. If you have a hard time choosing fabrics, I think the best bet would be to buy a collection of 20 fq's from one line. That way you know they will play nicely together.