Though we've cut back a lot on iPhone case coverage -- particularly in what seems to be a never-ending collection of cheap-looking plastic shells -- Ozaki's iCoat Wardrobe ($30) caught our attention for one reason: it's the first case in a while to be sold as part of a set, and the first we can recall that's designed to be replaced on a daily basis with a different color. One version, "for her," includes pearly silver, gold, purple, pink, and red…