The Escher copyright owners are very particular about where the images are used I heard.

Well, let's see. The image on my wall right now is 64 years old. I don't know enough about copyright law to know whether that places it into public domain or not, but I have to say that a low-rez scan for the player screen couldn't possibly upset them.

Anyway, all of the escher images can be grabbed directly from the web at http://www.worldofescher.com/ for anyone who is interested.