I like to quilt bargellos following the squares of a color , sewing in the middle of each color square just going from intersection to intersection or point to point. It gives a greater sence of movement. Start at the edge at a seam go that color going to the next seam intersection continue on in the same color.
There are some great examples :
http://www.quiltingboard.com/user_page.jsp?upnum=2278