If I understand your question, you are asking if you can sew solid strips of fabric between your 6" rows of patches? Yes, the solid strips are called sashing. The can be any width, but since you are a beginner, don't make them too narrow. I would suggest you first sew 4 or 6 of your patched strips together to make a rectangle or square, a bigger block to work with. Then cut 2 1/2" wide strips of your solid fabric to use as sashing between your patched blocks. It may be easiest for you to build your quilt one row at a time: sew one patch block to a solid strip, repeating till you get the width you want. Then add one long solid 2 1/2" solid strip as sashing to the bottom of that row to create the sashing between the rows. Keep adding rows till you have the Length you want. Have fun!