I generally prefer to use dark color schemes for personal use, but I would rather use the default theme when I do work. Is there a quick way to switch between them without having to go through and change each setting? Just to clarify.. By theme I mean all of these together: style, color scheme, icons, and plasma theme.

Is it possible to have an entirely different theme on each desktop? Maybe allow for multiple default themes and have a shortcut to switch between them? or possibly a plasmoid to quickly change theme? I am aware you can change plasmoid themes by using the activites feature.. but that really isn't what I am after.

I am new to kde so I am not really sure what options are available for doing this. If it isn't currently possibly I think it would be a very useful feature to include.

This does not appear to be possible at this time unfortunately. Apart from making a feature request, the only thing I am aware of that you could do would be to have seperate $KDEHOME directories, set up differently for each directory and use scripts to start the KDE session from a virtual terminal.