To clarify, you need a custom statusbar texture in the shape that you desire. If you aren't comfortable creating your own layout in oUF, try Stuf.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
To further clarify, there is no way to make a frame that is actually non-rectangular. You can only imitate a non-rectangular shape using textures with transparent regions.