Dr Pepper Clock
We just got a really great Dr Pepper restaurant clock, as featured in the arcade scene of Wargames. We think it's meant to be modular and can be attached to lighted menu-boards. It's got a pass-through 110V plug so you can daisy chain stuff off of it, and the side trim is easily removable to clip in a sigh board on each side.
However, while it is beautiful, it doesn't need to be on all the time, so I added a switch. The wiring is very simple with just a couple of wire nuts tying the inbound power to the AC plug and fluorescent light. I found some suitably retro-ey looking switches on Amazon at 6 for $9.
We decided to put the switch on the bottom just in case I cracked the plastic or something similarly horrible happened. All in all, very straight forward, but one pro-tip was in drilling the hole. I started with a small drill bit and worked my way up, but when I got to the larger drill bits I ran the drill in reverse to just use friction to make the hole rather than trying to hog out a hole in very thin and brittle material with a way-too-big bit. This worked /great/, thanks Dave.