I have ordered some strip bundles (maybe called jelly rolls) of moda material and there was enough variety for my liking yet everything coordinated. Last time I found I was spending too much time at the fabric stores and not enough time being decisive, I went to a black and white quilt with a touch of color here and there.
One quiliter I know pics three colors and builds a collection, as she finds them, of fabrics that only have those colors in them, whether it be just one of the colors, one with white, two of the colors or all three. She does not worry about whether geometric, floral, batik, or whatever; just sticks to those three colors and white. She also applies a 20% or 1 in 5 pieces can be solid colors or white, but no more than that.
A Stack and Whack Kaleidoscope with just one fabric would be cool. Cut each Kaleidoscope at a different area on fabric to get all different, yet coordinating squares. So, just one main fabric. Can use one solid color for all outside edges of squares or solids of all the colors in the printed fabric.
I tend to overplan, over coordinate, and when I do I usually am not as happy with the results as I am with the projects that "just happen" from scraps. I was once working on a scrappy quilt but took so much time matching the colors in each block. Then my son comes along and wants to try the treadle machine. His approach to matching colors was very different than mine. His was, "I have no idea of matching colors so I think this looks good" and I bit my tongue as it definately did NOT go together at all. But his finished square was artistically beautiful and better than all my organized one! Go figure.
(I checked out your first quilt......Great Job!)