dduffield

Here is my submission:
 
(Clickable:)

 
I also have an 80x80 of it as a suggested replacement for /usr/src/linux/drivers/video/logo/linux_logo_clut224.ppm:
 

 
Since I have proposed it as a kernel logo as well (like gentoo-sources), here's the one for hardened-sources:
 

 
Which is a miniature of this:
 
(Clickable:)

 
If I think of any other good ones, I'll do 'em and post 'em up too!