I have finally finished my positive/negative 9 patch. The borders took a bit longer than I thought they would.
I couldn't continue the border strips right to the edge because the math was a bit strange, so I had to improvise and place these quarter square triangles (I think that's what they're called) in the corner.
Have you heard of Klosjes? They are adorable and I will be back soon with an explanation and some "show & tell".