Services, such as a cuts (from $50 for men and $70 for women), color (from $90) and blowouts (from $30), are available by appointment only. 226 E 3rd St between Aves B and C (212-253-5490; graceheaven.com) John Masters OrganicsA visit to this environmentally friendly salon???powered by wind energy???is akin to entering an intoxicating botanical garden: The floral scents that waft in the air during