Making images that reveal what individual parts of a neural network respond to, as in DeepDream and the research of Chris Olah and colleagues.
Often "feature visualization" works are presented as modest sketches but I've found they can be incredibly detailed and nuanced, definitely worthy of a grander presentation.
Tom White, Reprogramming Sensory Habits
DeepDream (2015) was this really cool work using feature visualization to make these super psychedelic images.
Ryan Murdock, Ryan Murdock on Hacking AI