These are really great. You're definitely winning I'd say. Can I bother you for just one more variation? On maybe a light grey background, use some fresh light blues and greens (possibly something turqoise ish or teal), and maybe a light tan brown, possibly a light terra cotta red too. If you could play with just a couple more combinations, that'd truly be great.
Sorry for all the hassling! It's just that I really thing yours has potential — they look really great and are my personal favorites right now!