For horde on the second stage of Isle of Thunder, you can choose from pvp and pve dailies if you choose the pvp dailies you enter a area with Violet Rise peasants, they auto respawn and drop silver about 15-30 a kill.
The Violet Rise Peasants spawn along the water working
Not sure if it requires you to have the pvp daily, probably doesn't
It's not much money a kill but if you have some kind of program that repeats an action it can build up.