Markus' Logo
Markus already had this logo, even as tattoo, but not as a clean SVG nor as any other digital image in a decent size. Well that’s changed now, and he was even so kind as to invite me for diner, yay! 
Done with Inkscape. Effects done in Photoshop
These are the open source projects Markus uses his logo for:
libymp , cardcol , dircomp , cdmanager