Claf wrote:
Vokaris, are you using a software to do that work? I know there's a software (I dont remember the name) for that kind of effect.  

A photomosaic is typically assembled with software (I wasn't THAT bored to make it manually). I used 
Andrea Mosaic (freeware) but it has fairly limited functions and odd interface. A better one is 
Mazaika (not free). I'm sure there are many others, I found a (sort of) 
review webpage, but I'm not sure how current it is. 
I collected the avatars using Firefox 2.0 with the DownThemAll extension.