Now go outside and look at the sky.
While for the longest time I have resisted a favicon for my own site, I have always enjoyed how much can be squeezed into an icon of 16x16 pixels... reminds me a little bit of the old days when one had to handcode sprites for games on 8-bit computers.
I must have spent insane amounts of time squeezing little spaceships into 8x8 pixel 2-color sprites... all of the summer of 1983 comes to mind. :-)
Here is a great gallery of some of the best favicons on the web by Michael Pierce, which finally inspired me to get an icon for this site, too!
Via the always great Antipixel.