Random Copy is a freely distributable command line random copy program I use to randomize my classical radio station, paintings, set dressing, and pip boy backgrounds.  I've included a .bat file as an example of how to use it.  I've included 4 batch files: institute, paintingsgeneric, setdressing, and pipboy so it should be a piece of cake for you to modify.  Also included is the readme for Random Copy.  Thank you Nexus for giving us such a great forum! 

more info on Random copy:  http://www.governmentsecurity.org/forum/topic/6305-random-copy/