It would be great to have a Theme Editor where I can modify the theme more easily, like DevExpress has:
Since changing the color of the e.g. DarkMetro theme is not possible using the ResourceWasher.
Fan Chen commented
Agree! For example, you can set the accent color for Office 2013 theme pretty easily with ApplicationAccentColor dependency property for XamRibbon. However, if you use DarkRoyal theme, there is no way you can change the accent color easily, it will always be purple. Should have a theme editor similar to DevExpress that can change color for the dark theme.