Look at icon submission rules, please. Extracted from there is this:
- Before uploading a corresponding icon for another author's resource, you have to acquire that author's permission.
If the author has been inactive for a period of 6 months and beyond, you can upload an icon without permission.
But then again, in order for a matching screenshot to be approved, it has to have at least some effort put into, which I'm afraid for an aura a simple screeny won't do.