Rugged leather from yeti cave = gold!
Have you ever wondered about new opportunities for skinners to make gold? Go farm rugged leather! Every leatherworker needs a lot of rugged leather to level his profession.
The best place in wow to farm rugged leather is without a doubt the yeti caves in Winterspring. They respawn quite fast so you can keep killing them whole day. You get rugged leather almost out of every single yeti matriarch/patriarch and often even out of common yetis.
Rugged leather sells for around 40-100g per stack on the world of warcraft auction house. You can easily farm enough rugged leather to get over 600g/hour.