love this card. yes, the square shape makes sense. nothing worse than a business card that's square for no reason other than it's trying to be different for the sake of being... well... marginally different.
if only the the pixels in the background actually created a real mosaic image... and if each card could be a unique image, it would make it that much more interesting... and then you could go to their flickr profile check out their images. HMMM..... i might have an idea here.