In the end after lots of thought and angst I decided on oblongs/rectangles. I thought this would be easy but it wasn't that easy in the end!!!!
I sewed two oblongs together and then another pair which I put 'sideways on' against the first one. I'll show you.
In the pictures below you can see that I started three 'parts' - a back and two sides. This proved to be a 'good idea' until I started putting them together.
