Now this is a great DIY project. Building this will not only give you a real cool customizable display but it shows you just how versatile a micro controller can be. The PIC ( a PICAXE 18X Microcontroller ) runs 20 diffused blue LEDs to display just about any 4×5 pattern you care to program into it. Make a bunch of them and you could build your own scrolling sign, or just one and do something like make a compass display or whatever your mind comes up with.
[via MAKE]