Now someone needs to write a proxy that replaces all images on a site with placekittens, à la Upside-Down-Ternet (http://www.ex-parrot.com/pete/upside-down-ternet.html) and Kittenify (http://www.reload.me.uk/kittenify).
I didn't know about Kittenify, but they have better code. Though Placekitten has nicely curated images. A marriage is inevitable.