Disappearing 9 Patch - variation on a theme

Add a plain square to a D9P square and you get so many more layout options!

Simply...
-  cut a square of fabric the same size as the D9P block (after your 9 patch has been quartered)
-  draw a line from corner to corner on your plain square

 -  place your plain square on top of a D9P block (right sides together)
-  using the line as a guide, sew 1/4 inch seam down each side of the line
-  cut apart on the line

 -  press your block (seam goes towards the plain square)

- you should have 2 mirror image blocks

and here are some layout ideas....