Ice Ice Baby (image placeholders)

[MarcC]

http://nicenicejpg.com/

A friend of mine built this. I thought it was pretty funny. I have used placekitten.com in the past, but with a '90s rapper things just got a lot more fun.

[OrganizedFellow]

I'm a big fan of this one

https://github.com/imsky/holder

It runs locally via javascript.

[Chris]

i like this: https://github.com/ryhan/fixie

it has an option to fill all empty tags with placeholder content (images to) - so it's nice to write templates and at the processwire codes later.