I got a Amazon gift card for Christmas, so I picked out these little cellphone lens adapters ( See http://www.amazon.com/gp/product/B005GTR1CA/ for product info). There’s a fisheye, wide angle & macro that unscrews from the wide angle. They each magnetically attach to a small metal ring that you stick around the lens of the cellphone camera.
They do fairly well for the money and have added a lot of additional options to my Project365 that I’m doing this year. I’m just paranoid about losing the lens caps and the little magnetic fobs are all but useless unless you feel like donating your lenses to some random person downtown.