[GT40FIED]

Ok...here's what you guys do. Find out who hosts the sites and then write a strongly worded email or make a strongly worded phone call to the people running the site and tell them that if they don't remove the images, give you credit, or pay you a fee for using it (essentially royalties), you'll be forced to make a report to their ISP's abuse department. ISPs don't particularly like sites that conduct illegal activities since they can be held accountable as well once the problem is brought to their attention. And presenting someone else's intellectual property as your own is a big no-no. Taking further steps to evade protection measures (i.e. removing a watermark and using your own or "copyrighting" an image that isn't yours) is even worse. They'll basically be forced to comply with your demands or risk losing their source of income.

If you guys want any help finding their hosting companies and contact info, let me know. I'd be out for blood if someone did something like that to me.