Skinning is one of the easiest ways to make money in WoW regardless of your character’s level. Once you reach the low to mid 60s there’s a great opportunity to get Thick Clefthoof Leather from all of the varieties of Clefthoofs in Nagrand.
On my server, Greymane, right now Thick Clefthoof Leather is going for between 150 - 200g a stack. Single pieces are around 6g (which is twice the buyout listed at Wowhead).
Of course the drop rate on these is pretty slim but on the bright side you will get a lot of Knothide Leather which is an easy Auction House sell.