In my Jobs Management app built on Community Server I needed to display job documents. Another in-house Document Management application already had a page that displayed documents based on jobs, so instead of designing original Chameleon controls as usual, why not iframe in an existing document management application page with some slight editing and styling. There were security rules that could be easily handled by going with an iframe as well. The result was that we could add job document support in less than a day.
The screenpic below was the end result. It looks and functions like any other Chamelon-based Jobs Management application we've seen thus far.
The docs.aspx page holds the frame and is what you see above. A RedirectUrl property is generated with the help of base pages that are derived from CS's context-sensitive theme page architecture.
Now on the redirection page making the hand-off to the Document Management application, I thought it was interesting how to access to the Community Server context while avoiding frame-within-page null reference exceptions. The docsredirect.aspx page is located in the site root and inherits from CSThemePage rather than an application-specific theme page with its normal inheritance stack. At that point you can get really groovy with dynamic url construction.