Sphere icon theme is complete and well designed for Linux. It is reached to version 1.2.5 and got many improvements. We added blue places in our PPA, If you want to try other colors (Dust, Orange, Red, Green, Petrol and Violet) then go to source link and download. Sphere icons offer more than 8000 icons from 16x16 to 255x255 sizes. Developer mentioned there is some white frame issue in Nautilus 3.6 with some icons, most of icons fixed for latest Nautilus.
To install Sphere icons in Ubuntu 13.04/12.10/12.04/Linux Mint 15/14/13 open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
To install Sphere icons in Previous Ubuntu/Linux Mint version open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal: