Indigo is one of those things I can't wrap my head around. To me there's blue and purple and shades between, but nothing I am percieving as a separate "indigo" color. The one time I tried a rainbow month I replaced indigo with a B&W day in the middle. You're doing great. Go you!
You gave me an idea re blueberries I just bought...haven't used my macro in ages...am sure Jim can sacrifice one of them (I don't eat them, they are 'his') for 'art'. I like the result, even knowing you had to PS in the color. That makes it more fun.