Since the ornamental pattern that fills the surface of the circular sector is approximately the shape of a triangle, these patterns can also be used to decorate triangle surfaces.
If you need a round pattern that doesn't belong to any style, then one of these four may be right for you.
All the above patterns have been drawn in vector software Inkscape; to be more precise, they were drawn while practicing and exploring the possibilities of the said software. Basically, such circular ornaments are very easy to draw. They normally have radial symmetry, so it is enough to draw just one segment of the pattern, i.e., a circular sector pattern; the entire round pattern is obtained by rotary copying of the segment drawn. You can often make drawing easier for yourselves if the segment has axial symmetry, since in that case only half of the segment needs to be drawn.
Pattern category
Free vector categories
Available file formats
2D CAD (Autodesk (dwg)) and vector (Encapsulated PostScript (eps) and Scalable Vector Graphics (svg))
Pattern license
Download SVG vector file format
Download DWG file format
Download EPS vector file format