unsure if this is a repost. sorry if it is! (i searched for recipe and nothing came up)
but, i've been using this method for a while to make gold and it still seems to be working great!
okay, here's how you do it! as most of you probably know, there are a number of faction-exclusive recipes/patterns/designs/etc. (full list here: Faction exclusive recipes - WoWWiki - Your guide to the World of Warcraft)
what i've been doing to make gold is buying these recipes from vendors (vendor ones are your main attraction but others still work also!) and using the neutral auction house to transfer them cross-faction, then selling them on the other faction!
nobody on that faction will have them (unless using the same method you are) and they are usually quick sellers.
over the last few weeks i've been pulling in 500g each for these recipes i bought for a couple of silver!
for me i've been selling them for 500g each and they have all sold (i'm playing us-saurfang horde).
good luck!
once again, sorry if this is a repost. mods delete if it is! i'm just trying to contribute