Well, not quite but Vodafone, which has been doing very poorly recently in Japan, is about to introduce phones with costumes.

Currently they have 12 costumes but I other than the bull which I find kind of cute the rest look pretty cheezy if you ask me.

Actually they have a "cheese" one.

and a tire

Here's the whole collection:

I could be wrong but I don't really think these are cool looking enough for the fashion crowd nor are they cute enough for the teen girl crowd but what do I know?  Currently it seems like the Docomo Premini-II is topping the charts.