That reminds me of this, not so happy story of daycare centers using Disney characters:
http://www.snopes.com/disney/wdco/daycare.htm
I know that members of the newsgroup: rec.arts.disney.parks had a pin with Disney logo and were told to remove it.
There are times when companies seem like bullies over copyright enforcement, but there's one factor people often don't realize. By law, if one can show that a copyright holder knowingly allowed their copyrighted material to be used without permission, it can be used as a basis to invalidate the copyright. In order to keep it, you have to demonstrate that you have enforced it. So when a company finds that its intellectual property has been used without its permission, it really can't "look the other way" for a good cause. However, that doesn't mean that they can't come to some sort of mutual licensing agreement with the other party.
For example, I'm envolved with a youth program that occassionally uses corporate mascots from a large company to promote our local group. We approach them, and pitch our idea. If they agree to let us use their copyrighted characters, we can do so, but they have to create and approve the art work used. We can suggest ideas for the artwork, but their artists have to generate the work. I believe this requirement is pretty common and I think this was one of the problems with the day care example. It was a bad PR event for Disney, but from the article it appears that Universal followed the model I mentioned... they came in and did the artwork themselves... with great fanfare. I doubt that if the roles had been reversed, the outcome would have been different.
With regard to the "three circles" mouse head design, I bet Disney owns a copyright on that one too... particular if the designed is used with anything that can construed as being about "Disney". For example, if you designed a polka-dotted dress that contained a "hidden mickey", you'd be safe... but if you made a shirt that had printed on it the three circle mouse head and the word "Florida", you'd be dead meat. The difference is if it can be shown that the average person would look at your work and think "Disney".