Tizo 4 x 6 Inch Calf Leather Picture Frames - Brown. Tizo Designs Calf Leather Picture Frames. Tizo sterling silver and silver-plated picture frames are all tarnish resistant. Tizo sterling picture frames all come with a high quality wooden back while the Tizo silver-plated picture frames are mostly with sturdy velvet backs. We also offer engraving on most Tizo silver frames.