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If you're feeling nostalgic and have US$250 burning a hole in your pocket, perhaps we've found the iPhone dock for you.
The iRetrophone Skyliner (http://www.etsy.com/listing/55539816/iretrofone-skyliner), designed by artist Scott Freeland, is a retro-style iPhone dock (compatible with 3G, 3GS, and iPhone 4) within a custom-designed, old-style desktop telephone. The iPhone connects via a standard connector within the dock, providing charging power and a working handset -- yes, the handset works.
Combine this dock with the aptly-named iRetroPhone iPhone app (http://www.geekalerts.com/iretrophone-rotary-dial-phone-app-for-iphone/), and your iPhone retro-izing is complete. But for $250? They lost me there.