Thank you all for your replies!
Maride - I usually don't like my quilting to take away from the quilt (after all, I spent weeks on the quilt, but less than a week on the quilting, so I want them to see the quilt :D I have one quilt that has a black base but bright solids for the quilt blocks and I'm quilting in black, since I'm trying to make myself like the idea of the quilting standing out), so I usually do swirls and loops. I'm trying to break that habit and be more creative. I very much like the idea of variegated thread - thanks!
bebe - Yep, that's it! I see these quilts everywhere, it's kinda cool. Very simple to make, if anyone's wondering. I made 2, then designed a 3rd one with different fabrics but the same basic block. I really really like the quilting that the person in the picture did. I'm thinking that might be the winner.
Lisanne - I thought of doing the concentric squares, but then I can't use my Flynn Frame system and I hate basting. So that was the only reason that design got disqualified.
I'll definitely get pictures up when I'm finished.