DesignGraphic Design The ‘Really Useful’ Poster Series by Mash Creative ReddItPinterestFacebookTwitterTumblrLinkedinWhatsAppTelegramMixVKLINEViberEmailFlip Really Useful Posters. Designed by Mash Creative, an independent design studio, based in East London/Essex. Really Useful Poster Series – Typographic Design by Mash Creative Really Useful Poster Series – Typographic Design by Mash Creative Really Useful Poster Series by Mash Creative Really Useful Poster Series by Mash Creative