There is a common misconception that you can copy someone's material, as long as you make minor changes. Nothing can be further from the truth.
I forget the exact wording of the concept, but it's something like "the common man principle", wherein if the average guy can see that it's a copy, then there's a violation. A local bank here had a logo consisting of a number one in a circle. A new bank came along and had number one in a square. They were sued, and had to change the logo.
Copyright infringements are rampant, so don't assume that if you see it done a certain way, it's legal. An exception to the copyright law is the use of an image in parody. Copyright holders have fought it, and lost.
There may be other exceptions for fine artists. Andy Warhol didn't get permission to use the Brillo logo. But don't do it until you know for sure.
In any case, don't drag the owners of this forum into the dispute. If in doubt, don't post.
UPDATE:
I posted this, only to see that Michelle was posting a similar response at the same time. 