How to encapsulate the master page

Hi, we've started writing a standard toolkit for our asp.net applications so we've come up with one standard master page, stylesheet, errorpage, noaccesspage etc. that will be used by all our applications. Is there a way we can add these pages to each individual application from one central location - so if any of these standard pages change, we only have to change them once and not numerous times in our individual projects?? I tried to build these pages into a standard .dll to no avail. Many thanks.