These are only some of the ways
to computerize a Christmas Display
the information was put here to help give you ideas.
Merry Christmas (demo) of the display. 
Computer program - How does the computer control the display?
Light controller - What type of controller is used to control the lights?
X10 controlled - How is the display is turned on?
FM transmitter - How is the music transmitted to the car radio?
Other projects and things that helped make it all work.