I actually wanted to follow up with this for others that might be searching for acknowledgement of/a solution to this problem.
I'm still having the graphics artifacting problem. It was fine for a little while after the PRAM reset, but then started acting up pretty insanely whenever I use Premiere and After Effects, or heaven forbid, use them at the same time. Sometimes it even just freezes and shuts down. I know crazy, right! To actually be trying to use the MacBook Pro for pro purposes!
I've been searching this problem on the interwebs and it seems that some of the MacBook Pros with two graphics cards are having a hard time knowing when to switch between graphics cards and it freaks out.
The only remedy is to take it in to the Apple Store and have them replace the motherboard and/or graphics cards.
I own a production company where I do a lot of editing that requires me to use Premiere, After Effects and Photoshop. Editing is pretty much where most of my income comes from. So, you know, once I get to a point in the month where I can spare it for a few days, I'll bring my nearly brand spanking new computer that I use for my livelihood into the Apple Store so they can fix it. It's not as bad for me. I still have a 2010 MacBookPro that I gave to my husband when I "upgraded" to the Retina. I'll just steal that back! Regardless, I am less than pleased. But, you do what you've got to do, right?
Anyway, I'll report back for posterity purposes. Thanks again, Linc for your help with this problem!