I have the red leather, purchased on day 1 along with my 5s. I WISH my leather case would start discoloring! I have a red leather smartcover on my iPad that's got all kinds of marks and discoloration on it from natural hand oils, fingernail nicks and scratches, patina, etc- and I like the way aged leather looks. My iPhone, placed face down atop the iPad, looks WAY too new. I want them to eventually match!
That's what leather does!