The Geek/Nerd/Dork/Dweeb Venn Diagram (via Joel Esler’s blog):
BTW, here is a quick way to convert JPEGs which should be PNGs or GIFs (because they aren’t photos!): simply use a photo editing software (like the GIMP or IrfanView / Paint.NET) and reduce the color depth without dithering. This should pretty much get you there. You might want to play around with the number of colors to retain.