Custom shops can cut out logos on the side and light them with neon rope lights, add blue-green LEDs to the fans inside or give the box a custom paint job.
They are bound by custom and a concern that there will be misunderstandings or it will addto their already-full workload (both concerns were determined to be unfounded in the study).
So when I got my custom bike, I told Seven Cycles this and they built in an oversized seat tube toadd rigidity for my standing pedal stroke, an efficiency increase.