1. complete all 25 dailies for the day
(note : they can't be wintergrasp dailies)
2. fly to wg and relogin ( or zone in to any instance )
3. pick up the quest "slay them all" ( kill 10 alliance player or npcs)
4. complete the quest and hand it in
5. re-login or zone into any instance and you should be able to take the quest again
6. rinse and repeat ( remember to relogin or zone into instance everytime you want to retake the quest)
you get around 3200 honor ( or so) and 10 stone keeper shards per turn in.
EDIT: you can do this as many times are you like until the dailies reset