I hate putting a case on my phones, but I figured I'd try to throw one on the X since it's so thin. Plus I was starting to get stains on the soft touch 'woven white' backing. Never had a white phone before and I don't have anything white because I hate when things get dirty.
Decided on the black Areser super thin case on Amazon:
Amazon.com: Areser(TM) Ultra Thin Slim Fit Quicksand Hard Case + Free Stylus Pen for Motolora X Phone Google X Phone Moto X Phone (Black): Cell Phones & Accessories
Just got it today, but seems really nice. Hardly adds any thickness to the phone, a bit less slippery, and overall a good feel. I try to be super careful with my phones because I will never put a huge thick case on it. Also have the screen protectors from Verizon, but only because I scratched the crap out of my last phone screen without one.
Here are a few pics comparing my old Rezound to the Moto X. (pics were taken with my fiance's LG Lucid, so don't give me too much crap haha) Man is this phone thin, far thinner than my Rezound even with a case on. Plus, you can see I 'modded' the case a tad, taking off the bar near the buttons to I could actually hit them without issue. Feels way better than the original. Used a razor blade to cut off the extra plastic, then shave it down smooth to look OEM.