As you may guys already know about Vertex icon theme and most popular Nitrux icons, both sets looks great with different kind of themes and contains most of the icons. But satriani-vai took both icons sets and mix them up and created a whole new set of icons and gave it name "Vertrux". It also contains most of the icons and works with almost every desktop such as Unity, Gnome, Mate, Xfce, Lxde and so. Since this icon theme is fairly new, it might have some bugs or icon missing but you don't have to worry about that because this icon set is in active development which means you can report it and hopefully next update will bring fix. Candra themes used in the following screenshots. You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change themes/icons.
