I have only 1 quilt under my belt, but had happy results with 2 threads from Superior Thread; 'So Fine' in medium-off-white on rainbow color quilt top, and 'Bottom Line' in white on black/white print back. In addition, I think it helped going with a finer weight thread on the multi-color top...a thicker thread would have been too dominating and the light neutral offered a little less contrast.