I would just get a different model that already has RGB lighting, but I like the way this card looks. Is there a way to get RGB lighting into the MSI GeForce GTX 1080 Ti?
That is a standard founders edition card. Getting RGB going will not be easy if at all possible. By defult the led under the card is white with there being a thin layer of green on the GTX logo. Best you can do is run away the green to make a white, but any further then that would need some further rework to the led themselves.
This one: https://pcpartpicker.com/product/6R98TW/msi-geforce-gtx-1080-ti-11gb-founders-edition-video-card-geforce-gtx-1080-ti-founders-edition