How to custimize each forum icon

Do you mean this sprite?
node-sprite.png


You can edit it directly, or make your own and change it in the style settings.
But if you mean you want a different icon for each forum, you'll have to edit the node_forum_level template(s) with something similar to this:
Code:
<xen:if is="{$forum.node_id} == 10">
    <img src="styles/yada/awesome.png" />
</xen:if>
 
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