I hope you are not considering removing those completely.
Besides appreciating 'Dummy skin' for finding the right color elements, it would be great if it also had all elements (color and image) known to mankind in it.
Especially since currently there is no other source for a complete overview of those.
They wouldn't have to be enabled, but at least mentioning them would be great.
Without going into details now, there are elements for widening borders and seperation lines between panels. Might be handy to use and activate those. I have no specific examples now, but I have had some troubles finding some of those lines or borders through Dummy skin.
And you should definitely rename your skin into Smartskin!