Depends on what you want to pay. You can get a great one from gameongrapfix.com, formerly mamemarquees.com or go the shelf paper route. I would save up to avoid the shelf paper route. You have to look at that thing every time you turn on your machine. So do all your guests.
Technically, artwork and laminate does not have to be applied before wiring the CP. Generally speaking, it would not be a good idea and would likely involve rebuilding the entire control panel. It's not that difficult to do if you must; a couple of hours maybe. Unless you won't mind a bunch of ugly cut lines all over the artwork and overlay anyway.