That looks quite spiffy. Now get one with bright green, and Christmas will be taken care of. On eBay I've seen several 4s, 5s, and 6s with various colors. I'm sure they are re-covers, but what does that have to do with taking pictures?
As for Leicas, for as long as they have been around, there have been a never-ending run of "special" coverings and even "special" editions. Anything to be unique (and add to the price!)
<a href='http://www.rangefinderforum.com/photopost/showgallery.php?cat=500&ppuser=69'>My Gallery</a>