[accretio]

sorry dude, i think that's a bit too complicated for me. if i were you, i'd just change the default theme of the site manually and let the users not have a choice in what theme they use. you could also just edit the images of all the themes and still allow the users to change their own themes, as this will still allow the themes to change with each month. i really don't think it would be much of a pain to do it manually, so why do you really need an automatic script. sorry that i can't be of much help, but i don't know much about web designing, programming. cheers