I found this lovely stuff at the Zeilinger Wool Company in Frankenmuth, Michigan, while I was home in July:

So I swatched it a bit:

The Weasley blanket cometh...

...very slowly. But if you're interested, I made a Flickr album of the finished Weasley squares. Well, actually, they aren't really "finished," they've got ends sticking out and some of them don't look very square...ah well.