Before you start trying out these themes you might want to backup your desktop settings first, I have created a script to make this a very simple task and instructions / download can be found HERE
These screenshots show the basic desktop with each of the themes installed, remember this is only the basic desktop and there are a lot of changes with each theme that will only be noticed when you start to use it.
Each theme has it's own merits and it is totally down to your personal preference as to which one you should choose. There are also many more options from within q4os where you can adjust the visual settings.
enter sudo kcmodules --unlock into konsole to open up the TDE login manager, TDE theme manager and Splash screen manager, as well as a few other utilities for changing the look of your desktop.
I will add further information on these utilities later, Please check back soon for updated information.
Finally if you decide you want to go back to how the desktop was when you first installed Q4OS simply open a konsole terminal and type in the command
When this process has finished simply log-out and back in again and your desktop will be as Q4OS installed it. Just be warned that any changes you have made to your desktop (quicklaunch bar, colours, background) will be lost as it is basically a complete reset of your desktop.