Blender is a tool to blend objects. Through this Plugin, you can blend objects to create and distribute shapes evenly between multiple objects in Sketch. You can try to blend their Radius, Fill, Border, Opacity, Rotate, Size, Position. Same as Rectangles, but can not blend their Radius.
You should copy the original shape. Change the copied shape’s Fill, Border, Opacity, Rotate, Size or Position. Then apply the blend tool on them.