Quoted from wdpvideo:

No real story. Just liked the yellow, Plus I brake up the colors in my collection of games.
You could play the colors so many ways. Purple(s), green or even white. Once, I custom paint the ghost and door and pull out another little stops on the game should be what I like. I have seen other peoples games, that do what I do to my games for others and some look great and some look like ok whatever you like. I think all machines are that way. There is so many mods that can be done on this game. I spoke with a few people at the show, who do mods shared allot of great ideas. It will be fun to watch what comes out. Plus, it's nice to see Spooky Pinball support pinheads in building mods for their games.