Hello,
I've just thought about something and would like to suggest it for you if you may like it.
When you explore board index ... there are the forum icons .
I was thinking about customizing something special with your board, like customizing a small logo as this one .
I am not a graphic geek but thought to suggest it for you to play with it.
Like have an orange one for the unread forums and the black or gray one for the read ones.