Meh, I fixed the old stuff for the time being simply because I didn't wanna look at it...
But yes, a new dark theme is in the works. I love Cubic, I love the very clean white theme, but I understand that a good majority here prefers a dark theme. Because of this, the Lights On theme is being developed and fixed until I feel good enough to call it "beta". When I do, it will be moved forward as our default theme. At that point in time, players may still select the old themes.
Soon after, though, the dark theme will be pushed forward and will be the dark twin brother of Lights On. Once it emerges, I will give it a couple weeks to work out the kinks, and then the old themes will get phased out as new ones roll in.