In my subway Hipstamatic series, composition is a very quick, furtive process, with not a lot of time to pay too much attention to the background. This fact makes it interesting when background elements such as words add an additional element of meaning to the image. Here are two examples of images where I lucked out with some great accidental backgrounds.
In this image, I like the fact that to the left of the rider’s eyes the words “Soar there” can be seen.
In this image, seeing the words “Crisis link” in the background made it really interesting for me.