In the summer I'm going to install something along these lines:
http://www.aliexpress.com/product-fm...olesalers.html
RGB LED mounted on some kind of tape. It's small enough to be mounted on or under gutters and around moldings while remaining virtually undetectable. The IP-65 rating is good enough for outdoor conditions and they should last as long as the house if properly installed and maintained. Connect them up to the right controller and you'll have the ability to change color and then some. One time install and you'll never have to deal with the hassle of installing and removing xmas lights again. Plus not just for xmas, parties, special events, Halloween, the list goes on.