Get your mind out of the gutter people!!! (though after a post on stripping, I can only imagine the Google hits on this one!)
I found the Online Rasterbator a few months ago. I was immediately tempted to try and rasterbated (see, it's a word!) a few pictures, but never printed anything out. With our week at the cottage seeming like a month, I bought a cheap picture printer at The Wal of Marts and extra black ink cartridges and went to town with a pic of the girls.
I hung it in the staircase going up to the top floor. I'm not entirely satisfied, for various reasons. First of all, the white snow in the window turned into a just plain white square, which makes it look like something didn't print. I would need to re-crop or resize the picture to eliminate the right-most part of it. Also, the printer didn't allow for border-less printing, so I had to trim, which is fine, but I didn't do an exact job and there are slivers of white in parts that should be dark.
But all in all, I'm really happy that one pack of matte photo-paper and a roll of double stick tape can produce a pretty impressive staircase filler. The girls are thrilled to be able to sit in the mezzanine and look at their giant selves! it's 36 sheets of paper (6 by 6 for the math-challenged!) so it's a decent size. And when you go up the stairs and look at it, you can only see the dots and not really make out what it is until you get to the top and look at the whole thing.
So go ahead, Rasterbate!