Remove separating lines in list views

I’m using the krypton beta and love how much you can customize the skin.

All I want to do now to make my own settings/theme perfect (in my eyes) would be to remove the lines separating the single entries in the list views.
I think that way the skin would look cleaner and also (at least for my settings) better.

There are no color options for the lines themselves (so I could make them transparent there).
Has anyone an idea how I could manage to remove them anyway?