Hi, I searched the forums high and low but couldn't find a way to add themes to qtconfig. I don't know where they need to go. I don't actually run KDE, just have QT for Opera and would like to change to a better-looking theme; Platinum is just OK.
Musica con Spirito
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Qt widget styles (I guess that is what you are referring to as "theme") are plugins.
qtconfig contains a section where it lists paths which Qt uses to lookup plugins.
You can either copy new style plugins to one of these (I think they have to go into an additonal subdirectory called "styles") or add the path they are installed to to the search list