We recycled all our bound volumes. Ripped the covers off first tho, to make it easier for the recycling company. A good thing about the new no hardcovers policy is it makes them super easy to just toss in the recycling :).
We have a few of the old nwt, tho, including the old green one. Also kept a new songbook and the old mustard colored songbook (wow, why that color, of all colors. And you had to look at it twice a week).
I wish I had a pink songbook, I always liked that one.