I've had more consistent results when I copy the pics into PowerPoint and resize them to the exact size I want. I also print them on paper first.
I buy my fabric sheets in bulk from Dick Blick Art Supplies
http://www.dickblick.com/products/ja...et-fabric-kit/. They are a different brand, but I've been happy with them. My friend and I usually order together and buy the 30 packs and split the shipping.