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.
Decanter of Drowning
Drink and be merry, or so the saying goes. And the merriment shall not cease, for the cup you've been served simply refuses to empty. Worse still, as you stare into your depths you notice that it appears to be bubbling up from the bottom... is it filling itself?
In a sudden panic, you tip it back into your mouth, but it just keeps coming.
Design a beverage container - a cup, a jug, or hell, even a juice box - that fulls itself to overflowing. You might explore the mechanism by which it fills (be it mechanical or magical), the craftsmanship and aesthetic of such an artifact, or even the nature of the beverage itself!