Long story short, I got tired from having to look at white checkboxes on gray background in OBS Studio, and decided to make my own theme. I picked deep blue shades for this, as it’s a color I’m familiar with, and one of the colors that still has reasonable contrast when layered on top of another. This is what it looks like.
Main Window 
Source Settings 
Source Filters 
Generic Settings 
Output Settings 
Hotkey Settings
It’s available for Patreon and Github supporters now, and will eventually be publicly available once it’s done. The current version is 75% complete lacking only some elements, such as menus, tooltips, font picker and other similar elements. In my opinion this is much easier on the eyes than the default “Dark” theme, and I’ll most likely be using this from now on.