One of the side benefits of making Quatz Composer files is that you can use them as screen savers in Tiger (OS X 10.4) just by putting them in the right folder. The folder path should be:
Macintosh HD > Library > Screen Savers
or
Macintosh HD > Users > “Your User Name” > Library > Screen Savers
I put a few of my first tests online. They are rough but kind of fun and they all run off our RSS feed. Feel free to use them as screen savers or open up the source either way let me know what you think.