I saw a log cabin quilt done in two very sublte colors, if I had not seen it I would have thought "boring" . It was really really beautiful in its simplicity. The quilting that was done was what gave it the pizzaz. Wish I could give you a photo but it was at International and no photos where allowed of this quilt.
Just a suggestion : use muslin in place of batting , it will give a little more "structure" without adding much for warmth.