Choose from an array of existing fragrances -- many of which were named and created for royalty such as Princess Diana and Grace Kelly -- or have one custom-made. Subway: 6 to Bleecker St. Other locations: 897 Madison Ave., between E. 72nd and E. 73rd Sts., Upper East Side, PHONE: 212/794-4480; Subway: 6 to 68th St./Hunter College. 680 Madison Ave., between E. 61st and E. 62nd Sts., Upper East Side, PHONE: 212/838-2780; Subway: N, R, W, 4, 5, 6 to 59th St./Lexington Ave.