Anyways, in case you're wondering, a rasterized photo is composed of a bunch of small dots, which can give the total image a look reminiscent of 1960s Pop Art, such as this piece by Ray Lichtenstein:

So go out there and impress me with what you come up with; here's my favorite from their gallery:

Here's the link, now go on and give it a whirl:
RASTERBATE!