This tiny web service returns images` stubs with the given sizes. In fact it provides http interface for lorempixum package.
Try it online:
$ curl https://lorempixum.herokuapp.com.herokuapp.com/jpeg/100/100 > foo.jpeg
I use it to get images into static html markups during development
localhost/{format}/{x}/{y}
Could be jpeg, png or gif for animated images
Width and height of the image. Should be positive integer, otherwise web server returns a bad request error.