Added a simple {{TOCright}} template to float TOCs by the side, so there is no big gap at the top of the page.
You can definitely add some colours in there, using a simple contrast on a monochromatic background. Here are some vibrant pastel colors that could work well, as an example. Feel free to experiment, I think any kind of light background colour in the table heads and optionally the TOCs, can add that touch of colour. If it's desaturated it's boring against the gray backgrounds, so saturated works better. This can make it attractive, and reminiscent of some Japanese websites (that seem to be fond of pastels). It should work if I make a koohii skin later, as you can see eg. the light green buttons on the forum, against the light cream background.
You can definitely add some colours in there, using a simple contrast on a monochromatic background. Here are some vibrant pastel colors that could work well, as an example. Feel free to experiment, I think any kind of light background colour in the table heads and optionally the TOCs, can add that touch of colour. If it's desaturated it's boring against the gray backgrounds, so saturated works better. This can make it attractive, and reminiscent of some Japanese websites (that seem to be fond of pastels). It should work if I make a koohii skin later, as you can see eg. the light green buttons on the forum, against the light cream background.