That is a demo of Image's customized package. You'll have to ask him what he did and how to use his code. We do not support Image's customized package here.
I'm sorry, but I'm having a very difficult time figuring out what you want. At this point in time there is no .css file for Snitz, nor is there any mechanism for the users to select the colors, skin, or any other display property you want them to be able to pick on their own.
There may be MODs or other options, but until we can get a clear picture of what you want... its hard to help.