The magenta crystal artifice pattern drops off of the world boss on Belsavis. It dropped for my friend a few days ago.
The only reason Windu's lightsaber was purple was because Samuel L. Jackson wanted to stand out and requested that Lucas let him have one.
That's the way it should be, honestly. I like WotLK's method of letting you get gear one tier behind without raiding though. No reason people can't EVENTUALLY get the great gear.
With that said, crafting is a bit useless right now. You can't create gear that's on par with the really good stuff and orange gear makes low level patterns useless.