for a few euros on ebay there are light tubes for the inside of cars ... which you can install in the door panels etc.
I loosely put them on my XM Electro Statue.
Who also wants to give his electro a little more spice, and for little money ... look for the light tubes on ebay. Is operated with USB.
Here as an example with and without a plasma disc in the background:
without plasma disc:
with plasma disc: