If you want to try it out, be warned that it will block you (or even suspend you, if you are excessive about it) if you enter prompts that are sexual in nature, violent, or include the names of real people.
The more detail that you enter, the better. For example, I just entered this:
a room with a wall that is has the same color as parchment paper. the room also has a black and white checkered pattern tiled floor. a large painting with a wooden frame hangs on the wall. the painting shows a bomb with eyes and legs, with a blue sky with wispy clouds. Mario from Super Mario is running toward the painting. his back is to the viewer.