I currently am using RPG Style Inventory Revamped, which has a unique default color set not available in the presets for Quality Colors. It also has no easy way to change all the colors at once, which is why I would look at moving them to a preset here instead to keep consistency between the trade and inventory UIs.

The colors shown in the color picker for this are:

Legendary: 1,0.5,0
Masterwork: 1,0.9215686,0.01568628
Excellent: 1,0,1
Good: 0,1,0
Normal: 1,1,1
Poor/Awful: 0.5,0.5,0.5

Is this something that would be easy to add myself? I couldn't find any easy config in the mod folder, but I may have missed something obvious.

Thanks