Though I might share my modified version of the Pagination Class: The current one looks ugly when using the tw/bootstrap css.
http://pastebin.com/31HpZQGd
Here's how it looked like after:
The current pagination class is under review (see http://github.com/fuel/core/issues), and will probably disappear as-is, since it is application specific, and doesn't belong in the core.
Several changes were proposed to fix layout issues, which have not been accepted due to this.