I recently started working on a small app that I wanted to look slightly personalized per user by showing a faded image of their city as a background.
I couldn't find a service that did this for me, so I made a stupidly simple one. Simply use http://g.jarqu.es/IP and it'll return an image of the city based on the IP address.
It shows me a blue field. Since it's not possible to zoom out, I cannot see which lake or sea it is.
Blue image means either IP didn't translate to city, or city didn't translate to a static mappable image.