Java SE (Java Platform, Standard Edition)

Hi,
This post might be a little off topic but last week I had posted about some places where I could get some free Java packages that I can include in my project. I checked out some websites as suggested, but I could not develop upon a good idea for a project.
Could someone throw in some ideas about a project that he or she has worked with or something that you would like to see developed. Here is what is required:
A Java GUI program is to be created which has a both a significant, interesting interface part and a significant, interesting computational infrastructure behind the interface (It should have at least 3 major components like JTrees, JMenu etc.). It should not focus too much on either GUI or the computation part, a balance must be sought. Other packages can be used in the project (Eg: A voice recognition package can be used and the GUI can be built; although that�s not quite what I�m intending to do here). It should be workable in 4 weeks of time.
If someone could just throw in some ideas about any project that they would like to see made, it would be just great!
Thanks all!