Besides being able to customise every single application, on the next version of AROS One also Wanderer will have its own default themes, I've created 4 "light" themes to make the Application windows more pleasant, to replace them just click on the icon and the script will do the rest, again no system reboot is necessary.
In the screenshot you can see the 4 themes created on Zune that will be used by default by all Applications, except those where the user has already chosen and saved the "custom" theme.
MUI/Zune works like this, if there is a preference the Application will ignore the system setting, furthermore customised Zune configurations for individual Applications can be edited and saved without any problems, while customising and saving Wanderer configurations is more complicated, to do this you first need to delete the configuration file in ENV and in ENVARC.