I'd love to be able to tell people about something that I've made -- but I haven't made anything. I have no idea what to make and no clue where to start.
Option a is a bad, but easy one -- go check out http://blog.stevepoland.com/100-web-start-up-business-ideas/ and do one. My opinion is that most of those ideas pretty much suck, though.
Option b: pick a non-technology related hobby (for instance, I like sailing). Go find some forums related to the hobby, and say "I'm a university student and a software developer, and I want to make some software. What do you guys need? What would make your life better? What bugs you about any hobby related software you buy?"
Read 40-200 pages of responses. Pick one that seems dead-simple to implement. Do it.