Changing Icons

[singa]

Hi

Preceding every category in my forum there is something what looks like an icon a square bulletin board with a paper and pin though it. It came with the 7.4.1 default version I got.

How can I change that to something more attractive e.g. upload my own customized icons to make the category title and description a bit more attractive?

Any pointers?

Thanks a lot.

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Anyone?

Please.