I'm not sure about other manufacturers, but I know SE makes early dev units of their phones in funky colors mostly to destroy it's market appeal until it's at a production state. Take the "Sakura" for example, which eventually became W900i, so I wouldn't throw out the idea that this is nothing more than a very early dev unit whit the odd color scheme SE tends to throw out.
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I'm not sure about other manufacturers, but I know SE makes early dev units of their phones in funky colors mostly to destroy it's market appeal until it's at a production state. Take the "Sakura" for example, which eventually became W900i, so I wouldn't throw out the idea that this is nothing more than a very early dev unit whit the odd color scheme SE tends to throw out.
http://www.engadget.com/2005/09/24/more-on-sony-ericssons-w850-s800-sakura-and-hermione/
With that said, this is picture in particular does look like a fake to me.