Actually Rick-

Most logos are bboth trademanrked and copyrighted. The artwork itself is copyrighted, while its use to identify the creator of goods and services is a trademark. If you slap a Hard Rock chip on a T-shirt, alone, you're violating most, but they will probably be most successful in prosecuting trademark because it appears that the shirt came from the HArd Rock. Since they sell a butt-load of t-shirts, you're also cutting into their business.

If you slap a Hard Rock chip, next to a Palms chip, next to a Caesars chip, etc -- then there's no likelihood people will be confused into thinkin that one of those casinos manufactured the shirt. You;re probably fine on trademanrk issues. You're still violating the various copyrights in the design by creating a dreivative work out of them. You could be sued by any or all of them.

I don't practice anymore, but my brief law career was in Intellectual property.