Change browser icons for web-client / ui-client

Hi All,

I am looking for a way to change the default icons in the web browser when starting the vCenter web client and html5 UI.  I want to customize the ico files, maybe change their color but I cannot find where they are loading from on my VCSA 6.5. 

We currently have 3 different vCenters and I want to help our admins always know which vCenter they are in, especially since two are almost identical (production and dr).

Any ideas would be helpful.

Thank you.