A little more info about the featured tiles at the top, if you're curious:
Unless an admin sets a post to appear in them, they are automatically placed based on their ranking as "Top" posts. This means that as you spawn great discussions, your topic will appear automatically at the top.
Of course, these tiles use images if there is one available - all you have to do is embed or link to an image in your post, and the tile will grab the first one. So if you get a topic listed in the tiles, first - Congrats! Second, stick an image in it to make it even cooler!