I was struggling to see the how much mana was in the mana bar. So I made this addon!
You can change the color of all mana bars to whatever color you want. This can be done in 3 ways:
#1 - The simplest: Open the game menu (Esc) -> Options -> Addons -> ManaBarColor -> Choose one the Color Presets.
#2 - The color wheel: Following the same path from above, click "Mana Bar Color" (to the left of Color Presets). This will open a color wheel. Click, or click and drag, to change the color of the mana bar. You'll be able to see the mana bar color change in real time, so you know which one works best for you.
#3 - Manual input RGB values: By typing /manacolor (or /mc) followed by an RGB value, you'll be able to get exactly the color you want. Example use: /mc 0 0 0 This will make the mana bar black. You can google "rgb value for " to get the rgb value of your color.
I also implemented the option to have different mana bar colors on different characters. As the tooltip says when you mouse over the option: When enabled, this character will use account-wide color settings. Characters with this disabled keep their own settings.
This is enabled by default as I imagine most people will prefer to have the same color for all characters.