Are you trying to clean out those old swatches that have been sitting in a box?
I just started looking into giving my knits to Humane Societies around my location, and it appears that the only requirement is that it be washable. So all that superwash wool that I have been sitting on has now been given a purpose.
Most donations are accepted happily, and most of these animals, especially the dogs, really need to have something soft to snuggle in the kennels.
All you need to do is grab those swatches, decide how many will give you a decent sized blanket, and sew them up. This gives a nice patchwork look, and the animals of course, don't care what it looks like.
You will have to check with your local Humane Society to see if there are any size requirements, or if specific things are needed, With Autumn and Winter coming, wouldn't you feel better knowing that you made a difference with an animal that is still up for adoption?