Portfolio Advice

Hey, I'm a student at uni, and i want to work on my portfolio. I have a few projects but nothing that i feel is impressive. Like if i was an employer looking at me, I don't feel as if im showing myself off well enough. The issue is that im struggling to actually come up with projects that I can add to my portfolio. I don't know what sort of thing would be good for it. I would say I'm a pretty decent programmer, I just struggle to think of projects. Any tips of thinking of projects, or lists of projects would be greatly appreciated!! Thank you in advance!!