In a funny train of progress, I ended up creating a mod that changes portal colors. I thought someone else might enjoy this random stand alone mod too. Still trying to figure out pad colors, but not bad for a first mod.
You can change the color to red, green or white. The file is currently set to green, but you can choose which one is displayed by going into resources_override/textures_agh/structures/common and change the word "red" or "white" to reg.
Obviously you have to change the one titled reg to green first.
You can download it here, just unzip it in your resources_override folder.