There are mount achievements for mounts and if you manage to gather 100 you even get a blue dragonhawk.
BG marks are gone except for Wintergrasp. If you got any old marks from before the change you can turn them in for some honor.
Honor to buy stuff is quite easy to get even if you only run northrend instances while your faction got wintergrasp. Killing bosses then gives stonekeepers shards and you can turn in 30 shards to get 2k honor.
Winning a random bg at 80 can net around 5k+ honor...
I spent most of my warrior's honor to buy lvl 60 pvp set for my just for looks.
Weapons and the best gladiator stuff is kinda tricky to get as you need good rating and arena points(And i just refuse to do arenas).