I have, in my opinion, a great idea to market a product for an large, unrelated corp that is well trademarked. Here is the scenario: I have come up with, let's say. two catchy phrases, both working off a similar theme which is central in the image of the current customer base. These two "catchy phrases" will require them to be displayed with the Logo/trademark of the well known corp. Let's call the corp "Big Bikes". The phrases would be displayed in advertising, clothing, decals and other accessories. My question: Is there any intellectual value in the "catchy phrases"? I would like to present my idea to "Big Bikes", obviously with the expectation that, if accepted, there would be some value in it for me, as well. What if "Big Bikes" likes the idea and won't pay, or what is to prevent them from saying "no" and then turn around and use the idea? Is there any way to protect my idea? I realize there is no way to copyright the phrase. Any suggestions?