There. This one worked. The first try was a disaster, with a background that turned to mud the more I messed around with it. The first time, I tried masking out the flowers and painting the background first. This time I painted the flowers first, masked them and then washed in the background.
Masking fluid is tricky stuff. When I plan to mask a colored area, I paint it a little darker than I want the final colors. The fluid picks up some of the pigment when you peel it off. Also, you have to single stroke the fluid on, or you'll dissolve and lift even more color.