There are loads of things you could do but you need to make sure it's within your skill level or else you're going to have a hard time finishing the project on time. It also depends on where you're interests lie.
If you've worked in the console for the duration of you're course then you might want to make a little console game using something like libtcod(or roll your own although the latter is probably what you're looking for). If you're into Windows Programming then you might want to make a little software application like a Password Generator that stores and creates passwords... maybe even a little pong/breakout clone.