If i had a euro for everytime i change my GTK theme…. This is probably one of the reasons why i love Linux and open source software, the ability to customise and modify all parts according to your needs and personal desire. Here is a blog post from OMGUbuntu that i find myself agreeing quite a lot. I have recently changed desktop distribution to Ubuntu lately (the change to Gnome from Unity helped a lot) and trying to find themes (once again) i ended up installing Arc.
The catch is that Arc icon theme is not complete and you will find yourself seeing a lot of Adwaita icons because the theme actually falls back to Moca and/or Adwaita for icons not included in the theme. I personally love Papirus icons so i changed the index.theme to search for Papirus instead and love the result.