In the living room, I was able to make a 4x6 foot pad underneath our area rug without it showing. I'm very pleased with that.
Now you see it...
Now you don't!
HOWEVER, the bedroom is another story. I've moved our Momeni rug to cover some of the alphabet tiles directly in front of the crib. The two side areas are still exposed and hideous. The final insult is that the letter "T" was missing from one of the sets of letters (or magically disappeared upon entering my house; not impossible). So on one side, I am short by one stinking tile. Target had black shag rugs on clearance ($12!), so I picked one up to cover some of the remaining tiles. Even though I don't like the easily picked apart letters, I'm happy to have spent about $90 less than I had originally anticipated.