Boston is a minimalist and functional icon theme focused on basic shapes, a reduced color palette and visual hierarchy.
Newaita Icons
Linux icon theme
Numix Icons
Beautiful icons for Linux
Obsidiaanse ikone
Gnome Icon Pack based upon Faenza, optimized for dark themes
Qogir-ikone
A flat colorful design icon theme for linux desktops
Vimix-ikone
Vimix icon theme is based on Paper-Icon-Theme
Sardi-ikone
Circle-style and minimalist icons
Zafiro Icons
Minimalist icons created with the flat-desing technique, utilizing washed out colors and always accompanied by white.
Paper Icons
Paper is a modern freedesktop icon theme whose design is based around the use of bold colours and simple geometric shapes to compose icons.
Papirus-ikone
Papirus is a free and open source SVG icon theme for Linux, based on Paper Icon Set with a lot of new icons and a few extras, like Hardcode-Tray support, KDE colorscheme support, Folder Color support, and others.