Our banners at the new queue screen should be be a different color based on our last season's rank.
I think it would be a cool new end of season reward.
But basically those banners with our icons in them while we're forming a party/searching for a game could be different based on our rank. Silver gets a grey banner with silver trim around the summoner icon, gold would have a red banner with gold trim, plat would have a turquoise banner with the plat trim, diamond a dark purple banner with a diamond trim, masters an emerald-green banner with gold+silver trim, and challenger a blue banner with gold trim.
Here's an example I threw together of what the gold tier one would look like. Obviously rito could make it look better, I just adjusted some sliders in photoshop.
http://i.imgur.com/ckpFUiG.jpg
Also as a side note, are there going to be new profile trims to go along with the new styled loading screen borders? There's no new ones on the PBE yet.