Method 1: Change your characters race to a unintended one.
As people who use the PTR know, there's a set of premade characters available to copy, now normally you can only make eg a Human Paladin or a Undead priest, here's where the trick comes in.
When you go to create your character, just simply send the request twice. It will only use one of four allowed transfers but it will create the character twice, on the second character that got transfered it will have a faction change icon next to it. Voila you can now choose another race/faction for your premade character. I'm running around as a belf paladin and people are already asking how I chose that.
Enjoy.
Method 2: Unlimited Transfers
IMPORTANT NOTICE: You only have one shot to do this, and that is when you have 3+ premade transfers available, once you've used them all and reset it and used them again, if you logout and/or the page times out you won't be able to replicate this anymore, so make sure to copy all you need before you logout.
Just found a way to have unlimited transfers.
It appears each time you transfer a premade one then transfer a already existing character it resets the count of the premade one.
Just confirmed this and I have 5~ premade characters on the realm, already deleted 2 ally paladins as the proffs on them are bugged.
Proof that it works: http://i56.tinypic.com/2462fzp.jpg
Enjoy.