Featured: KDE Black-Transparent Plasma and Bespin
|Manually installing the various themes and icons which you download from dA and other websites is a fairly straight-forward task.|
Simply extract them to their respective directories listed below.
Plasma Themes: ~/.kde/share/apps/desktoptheme/
The KDE directory may be slightly different depending on your distribution. In Arch Linux it is .kde4 instead of .kde.