how to change qt theme from the command line

I realize it's a strange request, but I'd like to know how to change the QT theme from the command line. I've removed the KDE (and almost all of my QT apps) to save space (I use the openbox window manager) and was wondering how I could change the theme of my KDE apps without the KDE control panel. GTK 1/2 apps have two apps for this: switch, and switch2. Is it possible for QT as well? Or if there is no app available, is there a file that I could edit to affect this change? Just looking for any way to change the QT theme without KDE installed.

Thanks for your help.