Having trouble coming up with something to draw? No worries - while you'll eventually learn how to start from a tiny seed of a thought and gradually nurture it into a complex concept to explore through design and illustration, it's perfectly fine not to be there just yet.
For now though, here's an idea that might interest you.
Lost in the Multiverse
The dimensions have been... well, the scientific term is "rubbing" up against one another. It's caused some chafing, and there's been some... egh. Transmission. It's all very technical, and frankly, gross.
Take a character from one story, legend, myth, video game, comic, tv show, or whatever other kind of intellectual property and place them in the world of another, in a different setting, or in a different time.