Phone lens attachments are my new favorite thing. I got a pair of them (this fisheye and this macro/wide-angle) for around $11, and they are delightful. You put a little stick-on metal ring on your phone’s camera, and the lenses attach magnetically. In the first shot from the gallery you can see the field of view for the macro, the un-augmented camera, then the wide-angle and fish-eye.
Enough chatter. See some highlights of the fisheye and macro from my first few days with them (using my HTC One XL).