I think using that ewok for and avatar is a little different. I don't think anyone is usuing that ewok to promote their and it's not being used here to promote anything but CC's personality. I don't see where there is any damage by using the ewok.
For the banner in question, those are images from the movie, so they actually belong to lucas and if this other site wanted to use the same sequence from the movie, then there's not much i or anyone but lucas could do to stop them. In this instance, they did not go get the images from the movie, they just came and grabbed that banner and made it there own w/o doing any real work. Now they are basically using the same banner that TBS uses to promote the site to promote their own. What actually brought me to notice them, is that that banner is displayed on artoosnews.com's news page.
If you'll notice, that site claims to be for a charrity, i forget now what they raise money for, but i find it odd that they would have to ask for money when they are obviously good at just going and taking what they want.