I have a ASP.Net 2.0 site and want to translate it into MVC paradigm (I\'m new to this), but starting from Zero.
I have some themes in my old site, but reading here
A clean, semantically correct HTML with a good CSS is the way to theme any web app, whether it's ASP.NET, RoR, PHP, etc.
The best example of the power of CSS is CSS Zen Garden.
w3schools has a nice introduction/tutorial to CSS.
Each of your users could have an associated stylesheet which would get selected whenever applicable, i.e.: