If you think about it, LED's are like live versions of pixels.  You can use them to make something, and can do it pixel by pixel (LED by LED).  I have thought about on several occasions about making some simple images using LEDs, but that would take alot.

But I digress...  Hacked Gadgets is great for electronic nerds, like me.  They constantly have cool things people have built, and most of the time, a link to a place that shows you how to do it.  One of the latest posts is the top 5 spinning LED displays.  For those of you who don't know, a spinning display is a group of LEDs that spin, and light up at the right moment to display a picture, text, and sometimes games.