You could pick out a movie director and obsess over their works. For example:
Stanley Kubrick - Directed a couple of classics including "A Clockwork Orange", "Full Metal Jacket" and "Dr. Strangelove"
David Lynch - Well known for his "mind screw" movies, including "Mulholland Drive" and "Eraserhead".
John Waters - Infamous for making trashy, sometimes outright disgusting movies, all of which take place in his hometown of Baltimore, Maryland. Some films of his include "Pink Flamingos", "Cry-Baby" and the original version of "Hairspray".
Tim Burton - A personal favorite of mine. His films have a very distinctive, cheerfully goth atmosphere to them and frequently include similar visual motifs, for example stripes, spirals, and pale-skinned characters with dark rings around the eyes. He is perhaps best known for "The Nightmare Before Christmas" (which he produced and not directed), "Beetlejuice" and "Edward Scissorhands".