Not sure if this qualifies, but there's a guy on DeviantArt (http://sonic840.deviantart.com/) with some great geekified imagery.
The Hardware Poster (http://sonic840.deviantart.com/art/Computer-hardware-poster-1-7-111402099) is not only geek-art, but useful in a repair shop setting.
Most of it is CC-BY-SA-3.0, so you can print your own copy.

Nathan England wrote:
> Hello Hello,
> 
> I am re-entering the world of the living! I am moving away from the
> az.usborder with .mx and back up to the nice mountains
> ...,,,/^\/```*\..%../^\/```*\,,,...
> of Pine ! I am going to open a small shop for development and pc repair, but
> what good is a computer shop that doesn't have a bunch of cool posters and
> geek stuff on the walls!
> 
> I would happily forgo the MS Windows posters, but I'd love some Gnu/Linux
> geekness to put up!
> 
> So I am making a small request... Either information where I can get some
> free stuff to put up, or cheap stuff atleast... Or if anyone has anything
> they'd like to donate, I'd love to accept it!
> 
> I ran a repair shop as a service manager for about 5 years, this time I'm
> going at it as the owner... which really only means I'm really responsible
> now for my screw ups... or atleast I have to pay for them!!!
> 
> Thanks all!
> 
> 
> 
> ------------------------------------------------------------------------
> 
> ---------------------------------------------------
> PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us
> To subscribe, unsubscribe, or to change your mail settings:
> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss