Treetopia sells artificial trees, including some of the most ridiculous trees ever: two varieties of palm trees, Catalina Breeze or Coronado Bay; an upside-down tree that lacks the only benefit I had considered for upside-down trees, that they hung from the ceiling; and one tree that looks interesting to me called the Black Tiger tree -- but only because I would actually put it up for Halloween since it is black with orange lights.
If you prefer replica trees filled with pop-culture references, head over to your local Urban Outfitters for a Charlie Brown tree -- pathetic as ever -- or a Who-ville tree, ready to be stuffed up the chimbley. (They also have a little desktop Motherboard Tree with little LED lights.)
Is green too boring for you? How about shocking pink, blood red, or blue....?