Photoshop :: Image Out Of Small Images -> Customizing

I've been collecting all kinds of small cards and tickets. Like those that are clipped to a new set of jeans, or a ticket for a bus fair from vacation. Small pieces of paper that tell a story.

I'd like to make a poster, an image, out much smaller ones. I don't know how they are called, but everybody knows them. Those smaller images are put together in a checkerboard-pattern. Together they form a big image, that you one see when you take some distance, look between your eye lashes.

My question is: Is there a photoshop-filter that can do this, or is it a stand-alone application? Where can I get it?

I'm a MacOS X user.