It's a great quilt top!
I'd use the red thread for the border and the variegated for the blocks.
As for the quilting: I'd probably stitch in the ditch along the zigzag and use a rather dense design (be it squiggles, pebbles, loop de loop or even straight line echoing) in one of the fabrics. For example in the top left block, I'd quilt the print fabric densly while leaving the solid red without anything. That way, the darker fabric stands out more and you get kind of a 3D look (if you look at a picture of a mountain range for example, the darker mountains are closer, the lighter ones further away).