Here’s an interesting fact pattern. SunFrog.com is a custom t-shirt shop. You enter terms and the term is displayed on common designs. These designs are apparently created by the SubnFrog community of artists. I played with a bunch of search terms and it appears that a determination is made as to what category a particular term belongs to (profession, team name, first names, surnames) so that the customization makes grammatical and/or semantic sense (for so different terms generate possible designs. Examples above.
SunFrog has provided a guide to trademark and copyright for its users here.
Siemens has now sued SunFrog (see example above of shirt generated by using SIEMENS as a search term).