Now that we're even more muddled than we started, here's what I ended up with! :)
I swear that pinky finger is actually a green shade - if you hold that nail next to a blue, it looks very green; however, when you put it next to greens, it shows how much bluer it is than the others. Regrettably, I don't really have any other green of the right level of paleness to use there, and while I tried, I determined that I suck at mixing a single color with varying levels of white to make lighter shades. I did try. It came out very grey-green looking, so I decided to just use multiple polishes rather than a single polish with my pitiful attempt at lightening.
From thumb to pinky, I used Nubar Forest, Sinful Colors Exotic Green, China Glaze Treehugger, Sinful Colors Innocent, and that blue/green is China Glaze Re-Fresh Mint. I believe I just used two coats of each color. I was apparently less even with the second layer of top coat, after attaching the rhinestones, than I had thought. It didn't show up at all looking on my nails, even after seeing it in the pictures.