[Andrew Fawcett] I have been wanting to explore Custom Permissions for a little while now, since they are now GA in Winter’15 i thought its about time i got stuck in. Profiles, Permission Sets have until recently, been focusing on granting permissions to entities only known to the platform, such as objects, fields, Apex classes and Visualforce pages. In most cases these platform entities map to a specific feature in your application you want to provide permission to access. – Learn more at Andy in the Cloud