sandbox

sandbox n.

1. A low box filled with sand for children to play in.
2. A litter box, especially for a cat.
3. A protected, limited environment where applications (e.g. Java programs downloaded from the Internet) are allowed to “play” without risking damage to the rest of the system.

Take your pick. These collections are not-quite-serious groupings of pictures that have at least the whiff of some vague and unfocused ‘concept’. So welcome to the sandbox.