The demons in northeast Azshara are not only a great place to grind in your late 40's'/early 50's, but are also a gold mine for 60's. Each mob is between level 50-53, drops a decent amount of silver, and very frequently drop runecloth and even felcloth. After about 15 minutes of grinding them I had about a stack of runecloth and 2 felcloth.

If that doesn't work and you need gold quick, I recommend The MMORPG Exchange WoW Gold. They deliver quickly and are cheap! I usually receive my gold within 20 minutes. They're my secret weapon, I highly recommend them!