Sub Forum Icons help

[merk_aus]

Hey there everyone;
I was wondering if anyone could offer some assistance with something I am attempting to do with my site and that is to have custom sub forum images dependent on the forum.

At the moment when you have sub forums displaying on the ForumHome it displays an image:
images/statusicon/subforum_new-48.png

However what I would like to do is have it so:
Sub Forum 1 - displays image - images/statusicon/subforum_new-1.png
Sub Forum 2 - displays image - images/statusicon/subforum_new-2.png
Sub Forum 3 - displays image - images/statusicon/subforum_new-3.png

Before anyone directs me to modifications available on these forums I have attempted to install them however they don't actually change those sub forum images per forum.

I would really appreciate some help if someone knows how to do it.