As of yesterday the New York Times had a great ascii version of their abbreviated 'T' logo, and the text "All the code that's fit to printf()", along with a "we're hiring!" message.
They must have filled the position, though, because the advert is now gone.
I've had the following ASCII art in the source of my personal site (driverdan.com) for a few years. There are a lot of tools to convert images to ASCII so it's pretty easy to do.