Here are some awesome themes for the KDE and MATE desktops to brighten up your KDE and MATE desktop experience.
Lovely themes for the Linux Mint MATE desktop.
Helium Plasma theme for KDE 4.9: http://kde-look.org/content/show.php/Helium?content=125471. Screenshot: Helium Plasma theme.
Diamond Plasma theme for KDE 4.9: http://kde-look.org/content/show.php/Diamond?content=153930. Screenshot Diamond.
Aldebra GTK3 theme for MATE: http://gnome-look.org/content/show.php/Aldabra?content=142247. Screenshot: Aldebra.
Elements GTK3 theme for MATE and Gnome Shell: http://gnome-look.org/content/show.php/Elements?content=145920. Screenshot: Elements.
I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.
— Muad’Dib, Dune. Frank Herbert.