The opening of Marimekko's new Flatiron District store feels like a New York homecoming worthy of celebration. Sure, there was the little upstairs Marimekko showroom hidden away above Madison Avenue for many years, but that always had the feeling of a Bird of Paradise being kept in a canary's cage. How could the full impact of the inspired and colorful patterns by such great textile designers as Maija Maija Isola, Fujiwo Ishimoto, Sanna Annukka, Maija Louekari and Theresa Moorhouse