more seriously though, I take it you are wanting the blind to follow the curve?
Grab some paper on a roll, like wrapping paper or construction paper and create a scribe using a stick with a dowel on one end and a pencil in the other. Tape the paper to the wall, and follow the curve with the dowel creating a concurrent radius or just trace the curve of the window for an exact copy. Then you can measure and do the math to figure radius. Finally transfer it to a sheet of 1/2" mdf or 1/4" hardboard for a pattern.
Remember the radius increases as you outward from the center point of the arc.
If it's round do as David suggest if it's oval make a pattern with paper ,cardboard or thin strips of wood hot glued together and use your pattern to make your window blind.
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