The blue lines down the side make it hard to visually see a distinct category.
There’s various UserScripts available in the Third Party Developer’s Forum that actually makes these forums more user friendly, not to mention more pleasing to the eye.
In my script I have a few extras at the bottom of the first post (the colors edit script) that breaks up each section for better reading.
That said it would be nice to have a rotating color as well for each category and not just that blue color. 
CCPlease
Take a look here for my edit (Again, scroll to bottom of first post for the color edit):