I get the purple coloring too... No CTD though... That could be really anything including the game. Is it only with Skyrim when you CTD?

You might want to try uninstalling it and giving this texture pack a try.  It looks vastly superior and doesn't run much worse.  I also use this water texture pack, these HD blood textures, and this high res face texture mod.  This lighting mod also improves visual quality of Skyrim considerably, as does the Flora overhaul.
 
I run all of this with only one GTX 480 at 1920 x 1080, with 4x SGSSAA transparency as well and my FPS is usually in the 40s, dropping to the 30s occasionally (mainly in areas with dense vegetation.

Afterburner




I get the purple coloring too... No CTD though... That could be really anything including the game. Is it only with Skyrim when you CTD?

With the exception of BF3, which I gave up on trying to figure out, yes only Skyrim.  The CTD's are definitly related to the texture pack for me, when playing without the pack I no longer have the CTD's.  That picture is exactly what I was seeing with the pack installed.  It started with only bones and then I fast traveled somewhere and like 50 trees where that color, including a horse.  Thats when I unistalled and haven't had the issues.

boredgunner

_Nite_

I only had the problem that afterburner did, just that small piece of wood in towns is the only place I noticed the texture problem.

The texture pack still looks great, and I still recommend it over the Skyrim 2K HD pack, because it uses bethesda's original textures.

Skyrim's 2K HD Mod uses alternative textures that don't fit very well in the game athmosphere.

2k HD textures fit perfectly well into the game atmosphere.  Only a few textures have changed - see the above comparison link and judge for yourself.  Blows the official texture pack out of the water.

 
the author must have fixed it then, cause earlier builds of the 2K texture pack had that problem.
 
still though I'm fine with the official bethesda one.

I'm up to 80-90 hours in Skyrim game play and never had a single crash or fps issue until I downloaded the official texture pack.  I got my first CTD exiting a building in Markath yesterday and for some reason when I go into a certain building in Rifken and then exit the frames drop so that every thing is in slow motion.  If I reenter the building it goes back to normal only to slow to a crawl when I go back outside.  If I exit the game and go back in everything is OK again.  I wonder if I should try downloading and reinstalling the texture pack again. 

Same problem for me.  After installing the official texture pack I had a few lock-ups, strange lavender coloration on some objects, as well as the stutter/low fps whenever I exit a building.  I never had these issues before. 
 
I can't believe it's a memory issue.  3.6 GB of gpu memory and 6 gb of ram.  My cards are never stressed, all 4 gpus run @ about 45%.