I did the Bonnie Hunter Easy Street quilt and she suggested apple greens, shades of teal and purple. Teal works nicely with greens and purples if you care for a third color. Otherwise, I agree that more dark values would be nice. I learned from a LQS that if I take samples of my fabric and copy them in black and white on my printer, I can get a pretty accurate picture of how the values all work together. That might help you decide if you really need more than what you have selected. I love the greens and purples too!