Recently I was reading about a USB Christmas tree projector. With the help of that gadget you can easily project a Christmas tree by connecting the USB device to a computer or a laptop. The price of the device is also not that high. You will just plug in the device to the USB and adjust the projecter kind of thing to focus on a wall or a screen and you can see the Christmas tree. The best thing about this gadget is that you can also cahnge the color of the Christmas tree.