Hello,
If you are stitching a design, you can change whatever you choose :) There aren't any rules when it comes to the supplies or stitching. You can go with whatever you feel like since you're the one stitching it :) You can switch out fabrics, leave out backstitch lines, add backstitch lines, switch up colors and even change full stitches to half stitches. It's all up to you :)
~Kristi @ ECS