A background of randomly colored triangles - followed a tutorial by Espermaschine here: http://gimp-science-labs.blogspot.de/2016/05/filtered-triangles-background.html (without the filtering, but with an updated Inkscape color randomize extension (thank you, Jabier!)).
三角背景
autumn、background、colors、extension、inkscape、practice、triangle
秋季、背景、顏色、延期、Inkscape中、實踐、三角形
資料來源：openclipart ( https://openclipart.org/ )