MarionsQuilt: if you like your current layout, you could follow Tartan’s tutorial for the Faux Flowers, but in addition to omitting the extra leaves, you would also need to make the backing fabric (which turns to the front) two fabrics — that is, a circle with a center seam to join 2 half circles — so the fabrics on two sides of the window are different from those on the other side.
If you would prefer a true Cathedral Window pattern, you would then need to rotate it 45 degrees as platyhiker suggested so you have colored X s rather than colored + s. There is a good tutorial for putting together such a design by Jen at Shabby Fabrics for her Cathedral Window Patriotic pillow :
https://www.youtube.com/watch?v=9udI2DmmR1c
Great design. Have fun with it!