So this was mentioned a bit in the Improvements to Picade thread. But I thought I’d put this separately, as it’s a big mod topic!
There’s possibilities for lighting behind the marque, on the back door, and around the button and joystick controls.
You could then wire them to be responsive to your inputs or independent!
To start off, check out these photos of a few designs to mount a Neopixel ring around the joystick.