Seems that so many companies are coming up with these crazy cases for the iPhone since the introduction of the new iPhones 3G/3Gs. One is this metal case with Fish eye lenses which I think is pretty cool. Metal and leather case with interchangeable lenses, $200 for the case and $15-$55 for each lens but this case does have an impact on your reception levels.
Link: Gizmodo
Then there are these cases which make the iPhone look like it came from a Steampunk project. Cases are available in aluminum, bronze and titanium with the lesser meetals costing $95 and the high end titanium going it for $300.
Link: Gizmodo