Thank you for the detailed response, I appreciate it! :^) And I really like your interpretations, too. They're very thoughtful! The font looks so crazy on F because they're all flat PNG images and I was experimenting with the colors, so I promise the end result won't look like that. 🤣
F from the beginning has been my favorite, so I'm very pleased to see that it's has the most votes all around. But people who like C seem to be VERY adamant about it, and I can see why since it has really great color contrast that ALSO keeps all the shapes strong and easy to see. It's been incredibly helpful to see which kinds of covers people favor, so I can make these kinds of observations.
I think I'm going to make some variations of F, like adjusting colors and moving them to different spots, and then probably come back for a second round of voting. 