Now here's a subject you never thought you'd hear about in conjunction with New York Fashion Week: cat litter. Let's face it: it's not the most stylish of subjects. And neither is cleaning out the litter box, though it's a necessary responsibility of being a pet parent. The good news is that — in addition to eco-fabulous cat litter options — there are a wealth of fashionable and functional litter box choices that go beyond the old pan-and-gravel standbys. So just in time for the kickoff of NYFW festivities, we thought we'd highlight our picks of the . . . er, litter.