One idea I had is to create a piece of visual art (i.e. an image) with the following rules:

#1. The image must have the original size of 64x64, and be scaled to 128x128 using a "nearest neighbor" algorithm.

#2. The image must be monochrome (i.e. black pixels and white pixels only).

The images could be of anything, whether a game character, a pixel-photo, an optical illusion, or just a cool-looking design.

Any thoughts?