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Photojojo iPhone and Android Lens Series
If you're not interested in creating your own smartphone lenses, a reasonably-priced set of different lenses can be bought from Photojojo. Available for both iPhone and Android-based phones as well as a variety of other devices, the aluminium lenses are equipped with an adhesive removable metal ring to magnetically attach the lens to your phone.
Fisheye, wide angle, macro and telephoto lenses are available.
The Optrix iPhone Adventure Suit
If you want to push your smartphone's camera to the limit and try out underwater photography, the Optrix iPhone Adventure Suit is a tough case to protect your phone -- while you use the inbuilt three-element wide-angle lens to take pictures.
The case is available for $130, and can be purchased with the 'super sucker' for $180.
The iPhone Lens Dial
The iPhone's camera is pretty good, but if you want to turn things up a notch, the iPhone lens dial is a cool-looking magnetized accessory that gives photographers access to three different lenses just by rotating the disc.
The accessory -- priced at $249 -- has three glass lenses: a wide angle (0.7x), fisheye (0.33x) and telephoto (1.5x), as well as an additional macro lens for the iPhone 5/5s version. Two tripod mounts are included.