You can see my jelly roll quilt on this thread:
http://www.quiltingboard.com/main-f1...t128274-9.html
Mine is the second picture down on Page 9 - the green quilt top. This was made from a Wal-Mart jelly roll that had only 6 different fabrics in it. Maybe looking at mine will give you some idea of what a limited color palette would make, since you only have a few fabrics also. Most of the more expensive (Moda, etc.) jelly rolls have more variety in the strips so people get really different-looking results.