Polyline curve elegant polygon concise art PPT background image

This is a set of polyline curves elegant polygons concise art PPT background pictures, homePPT template webs provide slideshow background images for free download;

The first PPT background image is abstract color design; the third PPT background picture on the right side of the white curve below is the elegant blue-green; the second PPT background picture is the abstract color design; The fourth PPT background image is a crisp transparent gradient;