Twinking in the conventional sense isn't possible because the best obtainable
gear is prideful gladiator, which everyone who does serious pvp eventually
acquires.
However, in normal battlegrounds there are a number of items which add
significantly to your performance and give you a huge edge. Please feel
free to add your own items if you think I've missed anything:
1) Salyn Battle Banner.
No one seems to have any idea how amazingly useful this item is. Maybe it
is the 10 min cooldown. This de-targets you from all enemies in the same
way a hunter's feign death does, and makes you invisible for a second.
Done right, you can get away from any situation where you'd normally
die. I used the following on my gnome mage when near death: Iceblock,
battle banner, blink, escape artist (if necessary) rocket boots. I've escaped
from upwards of 20 horde using that approach.
2) Restorative amber.
Much faster at healing than food. Really essential item for any class without
self-healing. Very expensive unfortunately.
3) Noggenfogger elixir.
The shrink buff from this makes you very hard to target and is insanely useful
for any non-tanking class. Physical targetting is very difficult. Of course, there
are other ways to target players, but no one really uses them in normal bg's.
Note this can also get you into locations where only gnomes and goblins are
normally small enough to go into (eg this secret hiding place in the Isle Of Conquest)
: https://www.youtube.com/watch?v=ana_X2Aezsg
4) Rime of the Time-Lost Mariner.
This makes you ethereal and difficult to make out in a group.
5) Ethereal oil
Makes you translucent. See above.
6) Shard of Archstone.
Makes you literally impossible to target (note you can get hit by aoe). This should
give you the first blow against an opponent, which is usually decisive against a
player with equivalent gear and skill. I use this to "hide" Balinda in AV, and it always
buys me at least ten second extra.
7) Terracotta Fragment, Crate of Kidnapped puppies etc.
These are Pandarian items which summon quest guardians to fight for you. As shown
in this video: https://www.youtube.com/watch?v=sWGCauLLDlQ[
, these guardians do not despawn when the trinket is switched currently in pvp.
The Terracotta fragment is particulary useful because the Mogu Warrior it summons
has almost 800K health and is frequently targeted by players. His charge makes him
fairly mobile also.
8) Al-Li's Skymirror
I find this very useful when defending the flag in Warsong Gulch and Twin Peaks. Mirror
the flag carrier then stand on top of him/her. It is almost impossible for the enemy to
target the right player without luck.
9) Crystal Of Insanity
This buffs all your stats. Given that no one uses flasks in bg's this is really the only costless
alternative option.
I'd love to hear other suggestions if you can think of any.