DIY: Chevron Wall (with slanted ceilings)

In my last post I introduced you to my new wall in my bedroom. I painted it a chevron pattern  with two colors. All the how-to articles online were for square/rectangle walls and none accounted for slanted ceilings. So here is how I did it with going totally insane. (I apologize in advance for the wordiness of the directions it's sort of tricky to explain).

First Check out the before and after to see if this How-To will help you.