I made a thing…
350 LEDs arranged as a 2D tree, mounted in a cheap picture frame. It will draw up to 50W at full brightness, but if you value your eyeballs, then a maximum level of around 15% in the settings looks just great.
Patterns are a mixture of what I have found here on the forum and on the Electromage sample pattern resources as well as one or two of my own.
Happy Christmas, all.
Very cool! 
How tall is it?!
Thanks!
The complete display is mounted in a picture frame of around 400 x 500mm (approximately 16 x 20 inches). So it can be easily displayed on a wall, on a shelf, or wherever suits. Since the number of LEDs in the strings varies a lot, I use a 2D map to ensure that the LED strings appear linearly in the X-Y space. This means that displays such as the scrolling strips or the text output appear without distortion. Construction was relatively trivial - just a couple of evenings to mount the LED strips and wire them up. Obviously the wires are hidden behind the black signage board. I used white LED strips since I had them to hand - black would have been better. I also need to try adding some kind of diffuser to see how it looks.