Like the company's simpler Classic and Folded cases for theiPod nano, Skymate's new Designer Series cases for the fifth-generation iPod ($20) and iPod nano ($16) use a combination of fabric and clear plastic to provide fashionable iPod protection and a play-through front surface. Numerous colors are available for each of several patterns, including florals, flat colors, and plasticy retro dots, and each of the Designer cases has a small pocket flap…