Wow! You all replied so fast! :D
I believe that all (or most) of my yarn is Red Heart 100% acrylic worsted 4 or 6 (it also says No Dye Lot and Machine Washable on the wrapper, if that helps).
I really like the idea of totes, placemats and rugs. I'll check out felting, too!
As for the scratchiness, I'll try making a square to throw in the wash. If it gets soft, then I know that I can use them for clothes and such.
Thank you all so much! You really helped me out! ;)