I had two fat quarters with a white background and I debated whether there would be enough contrast to use them for the blocks. After sewing up one set of 1/2 square triangles I felt there was enough contrast to see the block pattern and since I have limited fabric choices for this quilt I decided to leave them in.
As you can see from the picture I used Thangles to make my half square triangles. I use them for block sizes 4 inches and smaller otherwise I use the square method - drawing a line and sewing on either side of it to get 2 1/2 square triangle blocks.
I also rummaged through my stash and found two light pink fabrics that can be combined for the backing - I was afraid I wouldn't have anything that would work and would need to buy more fabric. Since I piece almost all of my backs from my stash I was glad I had something that would work - after all my goal is to use what I have whenever possible!