A quick and simple image placeholder service

Similar (and more interesting?) service launched (and was posted on HN) about 1 year ago: <a href="http://placekitten.com/" rel="nofollow">http://placekitten.com/</a>

<a href="http://www.russellheimlich.com/blog/list-of-dummy-image-generators/" rel="nofollow">http://www.russellheimlich.com/blog/list-of-dummy-image-gene...</a>

I wonder in what situation such a service can be used? Thanks.

The referrer log of this should be interesting :)