Art is a critical part of any operating system's GUI these days. With that in mind, I spent some time doing an interview with the creative minds behind the Crystal icon theme. Primarily, Crystal is the default icon set of KDE, however Crystal icons have also wound their way into a Mac OS X icon set, a Windows XP icon set, a WindowBlinds theme, and more. The amazing popularity of this theme catapulted Everaldo Coelho from an unknown GNU/Linux user to one of the premier computer icon/graphic artists in the industry. Coelho, with assistance from veteran KDE artist Torsten Rahn, has continued to improve Crystal; a project they discuss in the interview that you can find here.