download the editor, open colour.bin file (as usual, do a back up if you want to do tests and stuff so you don't loose the original file), and then you can use the "change all" and pick one color from the palette and it will do a gradient with that color.
Or you can click on every square to pick up your own color or gradient.
You can make your units pink, or any color you want, including shinier/darker red.