You could
gargle for photographic exercises and follow suggestions. And/or you could give yourself assignments: tell stories, illustrate photo-comic strips, create propaganda, etc. And/or you could try mini-exercises:
* Only point the lens straight up, or straight down.
* Only shoot one color. Nothing else, just one color.
* Set focus to 1 meter. Only shoot at that distance.
* Add tubes; set focus to 10 cm; only shoot there.
* Only shoot chairs, or doors, or dwarves, or fires.
* Only shoot reflexions: mirrors, windows, ponds, etc.
* Add ND or IR filters; only shoot 30-second exposures.
* Shoot just one subject from every possible angle.
* Pick some paintings. Replicate them photographically.
* Shoot using a tripod on busy city streetcorners.
* Run into a bar. Take some shots. Run out. Repeat.
* Practice being a paparazzi, and stalk somebody.
* Do street photography while wearing a clown suit.
* Make a frame. Look through it. Become a camera.