I modded the Air Hockey to have blue coin door lights.
The lights were getting AC so I added a bridge rectifier to allow the LEDs that I used to operate on DC.
Close up of the bridge rectifier.
I replaced the wedge base incandescent bulbs with 12v blue led cluster from superbrightleds.
I was able to replace the yellow reject button housing with blue, but not the plunger portion. Turns out it is a custom part made for dynamo because they have their coin doors at an angle and use a shim to keep the mechs level. (notice the metal plunger portion is quite a bit longer than standard.)
It actually glows predominately blue even with the original yellow reject button. It only had a slight tinge of green. It is a deeper blue with the blue reject button housing though.