[SharePoint 2010] Free MasterPages from CodePlex

Codeplex projects propose some cool free features including 3 master pages for SharePoint 2010 :

Apple.com Master Page

Metro UI Master Page

Buried Alive - Halloween Theme

Those could be apply to your sharepoint 2010 site and customized.
Download link : http://spmasterpage.codeplex.com/
Other codeplex projects : Useful tools for Sharepoint 2010 from Codeplex