BeTheme Site: Developers of the first software theme manager for the BeOS system. Original desktop themes that cover art, misc, movies, nature, operating Sys., and Vehicules.
Fermilab Themes for KDE: These themes were made for Linux's KDE Desktop. Several themes available, that includes nature, landscape and mechanical.
KDE Themes: Information on KDE and a link to a program which partially converts Windows themes into KDE themes.
KDE Themes: Collection of desktop themes for the KDE environment for Unix workstations. Focuses on the built-in theming capabilities of KDE.
Theme Depot: The total solution for your X11 application theme needs. Allows users to comment on themes as well as vote for their favorites.