I have done the same look or similar to it with 2.0 as Pro Blue of XenForo...
So if you find any bugs or anything you wanna change with it...go ahead and change them and let me know what you think of the style for XF 2.0, 2.1 and 2.2
Some small edits here and there for it, but it still little a little different with a lot of the look and feel of it...
Add it as a child on the default style.
