Changing Color of Disabled Form Fields
Sometimes, you hit by a requirment of your client to change the disabled fields color in MSCRM forms/Entities. So here is an easy trick to do this. Go to CRM Web folder at CRM server, its usually located in wwwroot and open the file /_forms/controls/controls.css. Then search the following lines and just change the color from grey to the desired one.
Similarly, you can change the look and feel of other controls by searching them in this file. But please, do remember that this is not a supported way of changing color.