The shroud is easy to remove. There are four bolts, which you'll need to loosen through the fans. Once these four bolts are loose, unscrew the additional bolts which affix the side lighting to the shroud (It's one LED attached to a plastic plate). Now remove the LED connector at the back of the card, and the entire plastic shroud will be able to be gently pried off by gently edging the shroud mounts through the fan blades.
The internal LEDs are standard sizes, with built in resistors. They are attached with a dollop of glue, and a liberal application of adhesive tape to cover them.
Use a heat gun to remove the adhesive, pry each LED out, and replace with the color of your choice. Alternatively, simply disconnect the power wire to bring the light pollution down to a minimum.
The plastic shroud is oversized for these cards. To fit my 1070 into a case I had to jettison the shroud, shave off about half an inch, repaint it, and reinstall. At that point I disconnected those miserable LEDs. Haven't looked back. I agree fully that other colors would be preferred. Heck, Newegg even advertises some of their motherboards (the AM4 Carbon comes to mind) with blue lighting but the default is that red.