Paper vs Flat Remix
When comparing Paper vs Flat Remix, the Slant community recommends Flat Remix for most people. In the question“What are the best icon sets for Unix-like desktops?” Flat Remix is ranked 2nd while Paper is ranked 4th. The most important reason people chose Flat Remix is:
When an icon isn't provided by the theme, you cannot really spot it as this theme is quite close of the default with still a subtle and classy look and feel.
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Pros
Pro Flat and colorful design
The look of this theme is inspired by Material Design.
Pro Does total makeover of your computer
It's a complete theme, with custom icons, GTK, cursors, Gnome Shell.
Pro Nice cohabitation with default icons
When an icon isn't provided by the theme, you cannot really spot it as this theme is quite close of the default with still a subtle and classy look and feel.
Pro Under GNU GPL3
Based copyleft license.
Pro Very large collection
This set contains icons for many file types that are ignored by other icon sets.
Pro Flat but with some depth
Cons
Con There is jumpy behavior when switching from window to window
You can notice jumpy behavior when switching from a forefront window to window behind it. Both windows jump a little which can slightly disrupt normal working flow.
Con Under GNU GPL3
Limited use elsewhere.