Allow Users to choose background

I'm not sure if this is the right place for this..it does deal with appearance..so I hope it is right.

I was wondering if anyone knew how you can make it so that users can have a little drop down box that allows them to change the background of the page. I was wondering because the girls in the forum didn't want a guy background...and the guys obviously didn't want a girl background. I have seen it before where if you join a site it gives you options for themes. I think its possible to do...but does anyone know how? So that I can make it so the guys can choose a background they like..and the girls can choose the one they want..lol..

To have users choose the background as far as I know is not possible. Also to have multiple theme/skin for your forum is currently not possible and has been suggested here.

Do you want to change the background color or picture?
It can be done with JavaScript, I think.

There is no way to letting other pick there background. It has been suggested in the suggestion section.

This feature is not possible on forumotion at the moment but it might be in the future.