I get a lot of emails asking how to get that uneven grungy look on stitches and wings. Here is how I do it. First off, let me warn you not to use a good iron. I bought an old iron from a garage sale that I used for this.
I take a spray bottle, and mix a strong mixture of instant coffee and warm water, shake real good.
Take your piece, I don't even use a stained piece of muslin, just do my stitcheries and wings with unstained muslin.Spray mixture on front of piece and immediately iron with your hot iron. Just keep ironing until you get it dry. If you want it darker, just keep spraying and ironing. Repeat for back of wing if desired. This is a easy way to get a grungy look.
You notice, I used a thick piece of cardboard under my wing piece as I ironed. This way I can just throw it away and not get my ironing board cover all stained and dirty looking.