Weird, I thought Cosmos Blue was a greener, more teal colour than that.
Actually just came to this thread from The Verge's video. I think Dieter's got good taste ^^
My saddle brown case is gaining a nice patina, I've used Mink Oil on it a couple of times, first time had little effect (I guess cause I didn't rough it up with sand paper first) but the second time softened and darkened it a little. Right now it's quite an even slightly dark colour all over. It's definitely much nicer than the black Apple Leather iPhone 6 plus case I had last.