Excellent point moshu!
Without being specific to sfboarders question, people are too willing to search for a quick solution.
When the best solution is too study the themes code you are trying to emulate and transfering your new found knowledge to your own project.
EDIT: Don’t take my comments personnel sfboarders. But think about what you are asking. For someone to answer your questions one of two things need to happen.
1 They are useing one of the two themes you mention. (1a – If not they must download the themes themselves in order to assist you)
2. They also are familar with your present theme and how inserting new CSS will effect it.
Besides the best way to learn is to do it yourself. I also have no doubt someone will also be able to assist you.