there is the mantra that "the best camera is the one you have with you" and in order to take full advantage of that i want to make a quick shout out for a (free) app that i love to take pictures with if i have no camera with me. it's called vignette (click for the link) and i find it a near-perfect solution for mobile phone photography.
below are some example pictures i took with that app. get it if you can and try it out, i think it's worth your time. (and no, i'm not sponsored in any way)
these were taken with my phone (galaxy s4) using the vignette app: