Trams and Triangle-Squares

About a year ago, I made a quilt where I had to cut off triangles that were large enough to keep, but not large enough to really know what to do with. I've been looking for a pattern for triangle-squares I could use since then. On a recent tram ride up one of the mountains surrounding the Vierwaldstettersee...


...I came across a couple houses that had triangle-squares painted on their shutters.



I'm not sure this is the exact pattern I'd like to use, but it's funny to find solutions around the world when and where you least expect.