I did one in 10 different shades of green from black background with bright lime green leaves to light background with dark green to light green with white flowers to a pale almost yellow green with medium green vines and various others in between.
I haven't done a blue one yet, but have had a couple of requests to do so...someday it will happen.
Most of the time I use blenders instead of solid colors, but it just depends on the quilt. I did one with bright pink, bright yellow and bright lime solids for sashing and cornerstones to go with a print that had those colors in it and I loved how it came out.