Find an artist to create the image for you in a high resolution vectored image. Then, contact this company:
They are the ONLY company in the Americas and Britain which hold the patent for graphic anodizing. I inquired about PE and Dye and they assured me that if what they do is real graphic anodizing, they are in violation of their patent. Otherwise they use vinyl graphics in the anodizing process as opposed to the image transfer pixodizing uses.