In a reverse way can be interesting to assign a logo image to the Main Link topics and to the Main Download topics..
And...
and can be also interesting to go in this way, creating something like an "Arguments" page where to find Topics associated to Links and Downloads... so you can have a Main Topic associated to a Main Link topic and to a Main Download topic and soon, i.e.:
Topic "Argument 1" with his Links "Argument 1", his Downloads "Argument 1", his Forums "Argument 1" and all the other modules if you need (and relative subtopics "Argument 1.1, 1.2, 1.3 and soon)..
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