So I am an artist and I get requests rather often to create a custom piece of art that creatively incorporates a trademarked business logo or slogan. For example, one person wanted a big metal wall display that incorporated the Nike swoosh. I do very modern/abstract styles, so how do I know if something like that is justified simply as a work of art or if it falls under some sort of copyright infringement? I read up on Andy Warhol's on-going issues with using celebrity photos in his artwork, but again it seemed like there were mixed opinions on that. I don't want to risk getting in trouble, but I would love to accommodate these types of requests if I am legally able to do so! Any help/advice would be appreciated... Thanks!