The torn paper at the top of the Calendar app is torture to anyone with the slightest hint of OCD. I just need to tear off the bits that were left behind and I can't!
I'm not trying to point to an Apple/Google horserace, but seriously, there are other aspects to design then skeutomorphicness. Textures that appear as subtle gradients in your periphary are barely noticeable for most the vast majority of the population. I mean, just ask a non-geek iOS user what they think of the silk texture in iOS and prepare for a blank stare.