I have never found a commercially available product that will reproduce a a true scale pattern. As mentioned head to the craft store fabric section and pick out a few different sized mesh that will work. You can also strategically buy produce at times that has a little different pattern or size (garlic clove bags, individual pears, onion bags at times, etc...) At the usual Wal Mart, Target, Bed Bath Beyond, etc.. they sell a "body sponge" that is a just a bunch of tied up mesh, garment wash bags for lingerie, etc.., and some collapsible laundry baskets also have some interesting mesh patterns.