First of all, if your question is about improving your resume, please also read Proving I have mad perl skillzzzlz. That's a long thread with -IMHO- valuable information.

Sourceforge is constantly updating. New projects are added daily (TTBOMK) and so is the Help Wanted System. So you might want to peek at it every now and then to see wheter something nice does show up.

Of course you can always start your own project. What bugs you, might turn into a great application (I've seen some nice "personal itch" scripts turn into beautiful code). Besides that ... well, why not put your work on your resume? If it's your code, and it works, be proud of it! You might want to make a webpage with all your nifty two- or threeliners. That might be a great help to others aswell, and you could link that page from your resume. It shows what you are able to do and should be a possitive thing during job applications.