i originally removed them because reimu had code for only 6 palettes. i expanded that to 12, but didn't re-add them, i'll do that next time.
the green one was a crappy placeholder palette though. i did a red, green and blue placeholder palettes a lot of the time, to be replaced with better, more elaborate palettes in the future.
the old ones are usually just token rgb variations, like richter's red/green coat.