Here are some of my favorite Christmas Holiday light display videos from YouTube. Maybe they will give you some good inspiration on how to decorate your house for the winter dark.
This is my favorite. Very inspirational. Reportedly, this was done by a laid off electrician: proof that there is good to a down economy:
This one is fun too. Set to Jingle Bells. To get a fancy display like this you need a Christmas light show synchronizer, but without it you can have a nice display too::