Find something that interests you, and see if you can come up with a program to make some sort of associated process easier. Alternatively if there is an aspect of your course that interests you that you can create a program around use this.
If you are really stuck ask yourself:
Are you really pursuing the correct area of study? If you have a career as a programmer you will be expected to take / flesh out vague user ideas and turn them into programs
Should you maybe get a hobby or interest? Or get out a bit more and get ideas to use?