Papirus Icon Theme is a free flat icon theme for Unity, Gnome, Pantheon, Cinnamon and XFCE systems. This icon theme comes with more than 1000 icons.This icon theme is derived from Sam Hewitt’s Paper icon theme.
Oranchelo Icon Theme is a free flat icon theme for XFCE4 system and you can also install it on other desktops like unity and gnome. This icon theme is based on Super Flat Remix and inspired by Corny icons by Patryk Goworowski.
Faenza is one of the popular monochrome GNOME icon themes. It provides monochromatic icons for panels, toolbars and buttons and colorful squared icons for devices, applications, folder, files and Gnome menu items. It comes with both light and dark looks for the desktop.
