two weekends, two quilt tops!

Last weekend I finished the Color Blocks quilt top; this weekend I finished assembling the stripey quilt top! Now it's time to get some quilting done. I'm trying to decide how to quilt both tops. For the stripey quilt, I'd like to emphasize the "woven" nature of it by quilting the warm and cool blocks differently, and I think I'd like to use a more organic quilting pattern to contrast with the linear nature of the blocks themselves. I have no idea what kind of quilting pattern to use, though. Or what color thread; a silver grey, or something bright? Different colors on the warm and cool squares? So many decisions that could give this quilt such different personalities.

Any ideas?
~Phosphorelated