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HELMUT Film Scanner
The Helmut film scanner, available on Android, transforms your phone into a photographic film scanner. When you capture images through the camera or alternatively store them in a gallery after shooting them with a DSLR, save the frame using the Helmut application. Crop, tweak, and use a number of color balance tools after the scan to digitize your old negatives.
Water drops that create a macro lens
One of the oldest tricks in the book, but still a valuable tip -- and free to implement. An alternative way to create a macro lens on your smartphone camera is simple enough -- place a drop of water on the lens and flip the camera over quickly so it does not spill, then have fun.
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.