One thing annoyed me however, and that were the icons in the Apex 5 Navigation Menu. Most of the applications had a menu looking like this, all options using the Folder icon:
While it is so easy to let the menu look like this:
By the way, does anyone know a more suitable fa icon for JSON?
In the Apex builder just navigate to Shared Components > Navigation Menu and select one of the options:
And choose a nice, explanatory icon for Image/Class. The Apex team even provided a list of values with the categorized font Awesome icons. Repeat this for all your menu entries, and you will have a much nicer menu at very little effort.
For the rest keep up the good work ;-).
Source Article from http://dickdral.blogspot.com/2015/11/change-those-icons-in-your-navigation.html