Need experience with OOPHP

Just the short week that I have been subscribed to this list, I have encountered numerous code examples using the new OOPHP. A bit of a culture shock, but since I also code in Java regularly, no conceptual difficulties occur. Only thing is now, that I would like to improve my OOPHP skill by writing some useful classes; I don't see any possibilities in my current ensemble of projects and therefore was wondering if anyone had some small project for me, which I would then try to implement. Preferably, I would get some response afterwards on where to improve, thus making me a better programmer. I stress I have quite some experience with the old, procedural PHP. Anybody interested? Best regards, Jasper Mulder