Citrix Web Interface gave you the ability to add a logo, changing a color of a line, and some other features. But there was no simple way of Customizing Citrix Web Interface.But, I said, we had created a page for Custom Branded Citrix Web Interface on our site Techstur.com.
http://www.techstur.com/blog/2013/06/citrix-web-interface-and-interface-customization-services/