I know there is a fun programme out there called Title Changing Studio which could change any applications title while it's running it can also change the icon. I find it unique... therefor I still have it. But I never really use it unless for small pranks when I'm at my friends houses, like renaming Mozilla Firefox to Future Internet Explorer and change to a improvised Internet Explorer futuristic looking icon. It's quite fun.
Yea I forgot to add a link. Here you go, it's pretty fun to use as you can change icon any running application. One such example would be the taskbar, including it's title. Though I believe the changes made only remain temporary while the programme is running, but I could be wrong.