I am using Ubuntu 12.10. As I was inspired by mac OS theme, I want to install that theme in my PC. Can you suggest me the way to install it in my PC?
See this post on NoobsLab and simply follow the directions.
It looks nice. There's a Firefox theme, Wallpapers, Cairo Dock, an icon set - the full package.
You can find other Mac themes besides this on Google, too.