Last winter I wanted to build a "bogen*" for christmas. Initially I started doing it by CNC, but my small sherline XY would have been way too small. (I think I have the g-code for it somewhere, or at least a dxf outline). Anyways, beeing to big I ended up printing it, transferring it to some wood, and fretting it by hand (using a fretsaw). After that it was pretty easy to add some blue LED's and a small PSU to power them. Last Christmas went pretty fast, and I never got around to take a snapshot of the finished thing, so here it is.
*in German the word "Bogen" refers to arc. The "Bogen" is a traditional Christmas decoration formed like an arc, decorated with candles/lamps nowadays.