This post is pretty childish. Competition and copycats have existed for centuries and will continue to exist long after you're gone. You think calling them out is going to cause them to have a sudden change of heart after they presumably ripped off your design? Probably not. And I'm almost certain it won't affect any of their future business. You've not only placed yourself in an antagonistic position, but are now open to rebuttals and return attacks. Didn't you read OXO's response to Quirky "calling them out"?

The best thing to do is either ignore something like this or find a way to use the situation to better your business, perhaps with a post about how you value design innovation at your company or, like others have suggested, selling a Wordpress theme.

Don't concern yourself with trivial crap like this; just smile, make the best of it and focus on doing your thing.