congrats! I hate coloring myself, so if you're like me and dont want to color, think about using either the blue or green ink to stamp the wash day.
or how about matting your layer or layers- example, the white piece with the blue or green, and the stripe piece with blue or green?
I really like your circle and really dont think its overpowering. if you're still not happy with it, then you could see what it looks like with a lighter color green CS and ink for the circle?
anyway, just throwing things out there- I really do like your card design and stamp/paper selections