Deciding to see how minimalist he could get before iconic video game characters became unrecognisable, artist Alexander Shen limited himself to a 5x5 pixel block. As you can see, even at such low resolution, you can still pick 'em.
Street Fighter, Mario, Sonic, they all shine through (though at first glance I'll admit I thought Sonic was Dig Dug). You can see some of the illustrations to your left, or hit the link below to check out the whole gallery.
5x5 Video Game Wallpapers [Flickr, via Alexander Shen]