That theme has many issues. It is installed on here because I am working on it for the NaNoWriMo forums and need to test fixes on a live site.
I cannot emphasize enough that this theme will break randomly and in weird ways!
Then get another one with a similar background - - my eyes just can’t take the all white or all black backgrounds.
Have you tried Vincent?
Just found Isabelle, will try that. Didn’t like Vincent (both times I experimented with it).
Other than the excessive whiteness, you’re okay with the default Light theme, correct? If so I can easily create a variant with a different background color. I only suggested Vincent because for those who prefer dark themes it tends to work for them.
I can also easily create a variant of the Dark theme with different background colors. Dark and Pink is that theme with just a different color palette inspired by the fearleading uniforms from Monster High 
EDIT: Just to be clear, Light, Dark, and Dark and Pink are all the same theme, just with different palettes.
The Default Light these is fine except for the white background. It is the white with black text that is hard on the eyes. Even just a light gray background is better than white. I don’t want a dark theme, just a different background on the LIGHT theme.
So, the background should be a light color. I have seen a really light baby blue, or baby pink work. I often set things for a very light gray. You don’t want the background overpowering the screen, just a subtle color to stop the black and white contrast.
If changing the LIGHT theme pallet to pink for example, I would make the banners a medium pink and the background a very light light pink. and keep the text black.
Two sites that do a good job with subtle color in background or in boxes with text are:
Big Closet Top Shelf
and
GirlTalk
They both use a very light tan as the background for posts.
Try the Teek theme I added a few hours ago. It uses the NaNo-Liteo theme’s base palette but with some minor changes.
It is missing a few CSS fixes, but I can add those later if the colors work for you.
I don’t have an account on girl talk, and after seeing this in the footer you couldn’t get me to register for less than $1000.
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That version has been unsupported since the early 2000s. Hell the company hasn’t existed under that name for almost a decade!
The Teek theme is nice and easy to read. You have a nice blend of colors with nothing overpowering. That is a combo that would work as a theme. Let me know when you establish a regular theme with something like that. Thanks for your effort and time on this. It is greatly appreciated.