The Uboachan Classic theme is so called because it is a manual adaptation of Old Uboachan's default theme.
Unfortunately, one must be careful when working with dark colors, because the appearance actually depends almost entirely on the end user's monitor. For example, this theme looks perfect on my laptop, but on my cell phone it's unreadable.
For this reason I made the "Uboachan Gray" theme, which uses light on dark colors. Whichever works better for you will depend on your device. I would actually appreciate more feedback regarding Uboachan Gray.