Javascript and jQuery

Since I learned the power of Javascript and jQuery, I like to build a nice project with them, the only problem is... I have no idea's what to make. I already thought of making a Symfony plugin, something in combination with sfForm. But making a Symfony plugin is from a whole different level, I still want to do that once, but for now I just like to create something free. Not bound to a specific platform expect for jQuery.I already googled for jQuery plugin request, but I couldn't find much. A thing I did think about, was making some sort of desk, something where you can stack blocks, where you could shuffle items. Something like BumpTop, but a bit less complex. But even without a lot of complexity, it still seemed a bit undoable.

Although, now I'm writing about it, it stil sounds pretty cool te at least give it a try. I should build some sort of API for it as well, so you can connect AJaX requests to it.

Have some other ideas I can build? Please let me know in the comments or via the contact page.