Smoke stuff.
Or just walk around.
awesome advice! i bet you've never even tried marijuana....
Why not go to a museum, you can pick up lots of inspiration there. If you want to get into game art, think of a wacky concept (e.g a hero character must collect various objects in some fanatasy-world) and start creating mockups and "sprites". I find creating mockups fun as you can be as creative as you like and not give a damn about the coding or how it would actually work.
If you want to create a more realistic piece, why not try sketching and looking online for tutorials on anatomy and drawing from real-life.
If you want to create abstract art, just make a load of shapes and fill them in with random colors... heh