Need ideas for a project

Of late I have been thinking of devoting some of my spare time to developing software tools that will help me to polish my skills as well as provide some amount of financial incentive. More than a year ago I had spent a weekend coming up with a draft version of Console4Jython. I spent a few months after that actively adding more features but later got into loads of work and things took back seat. I want to start again. I am not thinking of developing Console4Jython into a bigger IDE - there are much better tools out there. I am looking at building some kind of a tool or framework that fits into the enterprise world. Or maybe even contribute to one of the existing projects. I can code comfortably in Java and want to improve my Python and learn some Ruby.

Let me know if anyone has any good ideas.