Grey Looks color scheme for KDE 4
I liked the Dark Looks Color scheme in GNOME. But never found anything similar to that in KDE.
You might want to try this theme if you are looking for something which is gentle to the eyes while at the same time not too dark that nothing is easily visible.
IMO, this color scheme is well suited with the Plasma Aya theme.
Note: I'm no artist. Actually, I'm terrible at art. I did this because I didn't want to hurt my eyes. The end result looked good. I'm putting it up here just that it might help others with similar taste.