Yeah, it's been something that has been around for a few years now. Adam Gilchrist has one (with Travelex I think), and Michael Bevan was using it last year to advertise a new book of his. But there are size restrictions... it can't be too big.
I think the primary purpose of it is so that it can be seen on stump cam.
But McMillian with a Maccas logo? :? Well, I now have officially heard everything... wouldn't that be a better deal suited to someone like Inzaman? :lol:
Another one that comes to mind is Michael Clarke... he uses the space to put on the Australian flag. What a patriotic young man he is!