You can throw in another color in the dark skin you already have... If memory serves me correctly you're using navy blue, black and white, a yellow button was also seen I think. Maybe throw in some more of that yellow or maybe a green... It's really just a matter of playing around with different colors around and testing them out to see if they blend nicely. The dark skin is fine it just needs more contrast to it. I hope you understand what I'm trying to say. Anyhow good luck with your lighter skin.