Oxygen Project

The Oxygen Project is a project created to give a visual refresh to KDE Plasma Workspaces.
It consists of a set of computer icons, a window decoration for KWin, widget toolkit themes for GTK and Qt, two themes for Plasma Workspaces, and a TrueType font family.
The Oxygen theme set is used by default for Plasma Workspaces in most Linux distributions, like Fedora, Kubuntu, and openSUSE.
History.
The original purpose was to create a new set of icons but expanded to include a new theme, which included a new cursor, widget and window theme, and sounds. It represents a break with the cartoonish look of previous K Desktop Environment 3 graphics and iconsets, adopting a more photo-realistic style. One of the overall goals of Oxygen was to provide a nice looking desktop that did not distract the user, so the icons and themes use a desaturated color palette. The name Oxygen came from a joke between the developers that they wanted to ”bring a breath of fresh air to the desktop”.
Oxygen Fonts.
On the Oxygen Font sub-project was announced. The first release – version 0.1 – was done a month later. The 0.2 release from included refinements and added a monospace font.
Standardization.
The Oxygen Project aims to offer standard icons, guidelines and a style guide. It builds on the freedesktop.org Standard Icon Naming Specification and Standard Icon Theme, allowing consistency across applications. There is an ongoing effort for supporting these specifications in different desktops, and by different icon sets and themes, such as the Tango Desktop Project.