I bought a 3-in-1 lens that clips onto my iPhone. It comes with a wide-angle, fish-eye and macro.
It's pretty neat. The fish-eye and wide-angle blur the edges of the photos a bit more than I'd like, but for $70 in optics, it works pretty well in a pinch.
Spring blossom - macro lens
Magnolia - macro lens
False Creek bridge-to-bridge - fish-eye lens