The Register Your Application form allows for the (optional) submission of an application icon. Presumably this can be updated after registration via Manage API keys? I'd be surprised if not, of course, but I'd be happy if someone could confirm this so the world wouldn't need to see my untalented design and artwork forever ;) Thanks!
I confirm it (although i've never tried it :) )!
Yes, this works fine. In fact, this reminded me to change my app registration to include the new website URL.