I don't remember where I got this muslin... have had it a while. I know I have bought some at JoAnns in the past, so maybe this is it. It feels nice and is not loosely woven like some of the cheaper ones that are going to shrink a mile. And mine does have flecks. I prewashed it to tighten up the weave, and then pressed it.
Can't imagine how we are going to put a quilt together with these oddly numbered and sized pieces! It's surely a mystery...