Colours? Maybe not but some improvement is needed.
When you choose option "Show unread posts since last visit." you can see all new to you posts in the forum and it's divided to certain groups. What is wrong about it? I can see there same sections, like:
2x "General discusion". And I really don't know what part of forum it's from. (Sorry for grammar. I truely need to learn this english, once and for all.)