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.