My garage was just sheetrock. I converted 2 of the 3 bays into my game room. My wife parks in 3rd bay.
I purchased "Paintable wallpaper" from Lowes. I sprayed the ceilings white, in stalled wallpaper and painted walls a steel blue. I also place 2'x4' carpet rectangles down for carpet. 7 light swithches power 3 pins each = 21 pinballs. I have 1 long track light going down the center, on dimmer, w/ 10 spot lights on walls.