I'm trying out the 30 day trial version.
According to the ad for WB, you should be able to customize ever aspect of the desktop.
For example it says if you select a theme but don't like the color, you can change it, but as far as I can tell, the theme colors are fixed.
Also, I found the option to change the transparency and texture of the task bar, but not the color.
Does the trial version have features disabled?
Is there a help file available?