Earl, I'd be happy to change colors on your flags, if it helps. I'm not sure yet whose flags you have, but if they are mine, the vane is simple to change. The pinwheel is a little more difficult but I can do it.
I never realized how many people suffered from some type and level of color blindness until I started making flags. Some people simply have trouble distinguishing certain colors. Actually, reds and greens are very common problem colors for some people. You are the first that I've had to say that they had trouble with the chartreuse...but I don't doubt it at all. I've made several pink/green flags for people. That's what Gene Buckys and Tony Harper have. Both are premier shooters in their disciplines. I've also made several chartreuse/black and some red/white flags, as well as a few other combinations. Sometimes we can throw the research out the window as to what colors are seen best by individuals.
Let me know if I can be of help. Boyds post with all the different colors may help you determine what works the best for you. I do agree with what Larry was saying about watching all the flags on the range, but sometimes you just have to do what you have to.