No one cares what Bill Gates wants. He doesn't care about what we want after all
Anywho. ThemeXP.org is a good one, You have to download things in .exe format and it installs like 2 other programs, but theyre easily removed.
I wouldnt recommend it if you dont have spyware removal though because occasionally it'll install it.
Also, Get the Neowin uxtheme.dll multipatcher and you can just download themes and use them instead of using second hand software to do it for you.