How about the nice nostalgic glow of a neon sign?
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R1.TR2.TRC0.A0.H0.Xsin clair+ne.TRS0&_nkw=sinclair+neon+sign&_sacat=0
Or just type anything you can think of with 'neon sign' after it in the search and the possibilities are endless. It could go right on the exterior between the two doors. You'd have to check to see if it was okay to be out in the elements.
Castrol neon sign
PBR neon sign
Red Bull neon sign
Porsche repair neon sign