My favorite one is the engraved fuel cap! Looks sweet!
And I had a long thin plate made with the switch lables on it. I had made it so the screws holding the switches in place, would hold the plate, but the plate was pretty thin and unsupported between the screws. The plate came with a peel-off back, and after cutting off the wings for the screws, the adhesive holds its perfectly with out the screws.
And finally, I thought I'd have a nice taile # plate made for the instrument panel.