Where can I find the style used here on vbulletin.org

[Shelley_c]

Most of the changes (visually) can be achieved by tinkering around in the Style Manager. And, as stated in this thread, there are some hacks that can be implemented to achieve a similar look (like the tabs, new to the site). But why would you want to copy when you can tinker in the style manager and come up with your own unique look, it's a lot of satisfying and you'll always know that you accomplished designing your style without the need of replicating an already existing look.