What a great idea of 'auditioning' the colors in the seam allowance! I never thought of that. Here's two pics, one on the front of the quilt, one on the back. I did dark to light. The third one in is actually a mossy-looking-ish green with yellow hue, and it kinda makes it look like a shadow. Not sure if the red is too much contrast or not.
Dark to light
[ATTACH=CONFIG]193345[/ATTACH]
on backing (muslin)
[ATTACH=CONFIG]193350[/ATTACH]