This a modified version of UbuntuV.Graff, originally made by meisok on Ubuntu-art.org. I've done a neon edge detect and updated the artwork to fit in the ubuntu human color scheme.

All credit goes to meisok for the original image. Thanks for the cool image!
The original can be found here:
http://www.ubuntu-art.org/content/show.php/UbuntuV.Graff.V2?content=62538

This is a 1600x1200 png image.