Does anyone know of an American National Tartan or United States National Tartan?

Also, Ive been playing with the idea of registering a tartan for the MacHenry s or the McHenry s out there seeing as their isnt realy a clan McHenry we are more or less a sept of other clans, Damn. Well anyway here is my idea for a McHenry Tartan, photo bucket shrunk it though