If you want to sell or otherwise make a profit from my work, or anything derived from my work, you are morally and legally obligated to make arrangements with me.
If you want to create derivative works from my work for public display, that's cool. I don't even have to like what you do with my stuff. I do require that you give me credit, though. If your work is on a web page, you also need to inform me by e-mail about your page, and provide a link from it to my page here, or whatever page I may specify in the future as my page. This includes using my backgrounds!!!
That's not too much to ask, is it? If you have any questions about any of this, please contact me at forrest at abstractfactory dot org (no mailto link because of spammers).