Here is a silly article with a couple amusing trademark attempts I think you might enjoy. However, it also gives you a feel for the variety of claims that people think they can make.
http://www.businessinsider.com/15-ridiculous-trademarking-attempts-2011-4?op=1
I was pretty surprised to learn that Twitter was unable to trademark “tweet” when Paris Hilton was able to trademark “that’s hot.”
This was a very interesting piece and surprised me about what things are able to be trademarked and what cannot.