I love, love, love solid colors. I'm also a scrappy quilter so I always use a lot of solids in each quilt (I have a large solid fabric stash).....usually with a solid background. I'm very partial to white as a background as I use really bright colors and they do pop off the white. I don't think fabric for a 2 color solid quilt should be any harder to pick than say for a 2 color floral.