How smart can a Christmas tree get? Here’s something that may give you an answer. The Tweettree is smart enough to change its color based on your choice, every time you send a tweet. How do you choose your colors? Simply tweet @tweet_tree with the colors of your choice. And lo! You will see the magic happen. The Tweettree is a perfect gig for a Twitter addict this Christmas. It comes with a small embedded server inside it that connects to Twitter.