You might already be familiar with the K Desktop Environment, if not, be sure to check out the KDE website. In short, KDE is a graphical interface for UNIX-like operating systems. I'm currently loosely involved in the project by contributing artwork, reporting bugs and testing new releases. Oftentimes I write things that could be of use to other people, so here's a list of contributions.
Kontact Logo: Envelope
An article about colouring and finishing the "Envelope Concept" of the initial Kontact Logo sketches.
Kontact Icon Sketch
Sketches for the KDE Kontact logo competition, regarding the design of an icon and associated logo.
Universal Splash Screen
An article about my idea regarding universal application startup screens and startup notification for KDE.
The KBoggle Icon
An article about the design of an icon I did for the KBoggle puzzling game.
A suggestion and motivation for the design of KDE's desktop buttons.