Bargello Quilts by Marge Eide is a good basic book. (the main book featured on the page below. There are several others advertised on the page, too.)
http://www.amazon.com/Bargello-Quilt.../dp/1564770672
It describes how to make simple bargellos, and shows photos of more complicated bargellos, but does not describe how to make them. In the back there are pages to copy to design your own bargello quilts. They're striped lines, shaded dark to light then dark again repeating the pattern. You could do the same with graph paper. I haven't tried to figure out how to design a bargello in EQ.
A trip around the world quilt is a simple mirrored bargello with 2 planes of symmetry.