STEP ONE. On a blank canvas turn on your straight ruler and mirror ruler. Try to get them to match as much as you can. I turned my rulers 18%. Then you'll take any brush you want (I recommend any hard edge brush) and you'll draw on the edges so the corners are filled. They can be as wide as you want. They can also be any color you want. I just did black cause it's easier.
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STEP TWO. In a new layer, color the remaining space any other color. I did white cause why not. Make that layer the bottom layer.
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