Washington is a strong city for design.  Incredible architecture, international influences and award winning talent. But to the larger audience, we're seen as conservative and predictable. Sure we don't have the inventory of New York or the edginess of LA, but take a closer look and you'll find innovators, risk-takers and geniuses in their fields. One of those virtuosos is Darrell Dean of the eponymous antique store on Wisconsin Avenue in Georgetown.  His finds are always fresh and striking and completely original.  The man is brilliant.  His shop is a constant source of product and inspiration.  If I could, I would buy the entire cache.  Where is that generous benefactor?! …