Simple examples of latex usage I've gathered over the years

Metapost 宏包说明的中文本地化项目

Over 700 metapost diagram examples

This is a package called mpgraphR.sty for easy drawing with MetaPost in LuaLaTeX, assuming you have a LuaLaTeX document and use the luamplib.sty package.

METAPOST. Краткий курс

UML diagrams for LaTeX/MetaPost

Bendera Malaysia.

Generating Piet Mondrian like art using TeX, ConTeXt and Metapost

Art In Context - using TeX, Context and MetaPost for artistic Purposes

LaTeX/MetaPost package for making geometry diagrams in the style of Oliver Byrne's rendition of Euclid's Elements

MetaPost + TeX rendition of Oliver Byrne's "The first six books of the Elements of Euclid"

MetaPost library initially written to automate some elements of black and white illustrations for a physics textbook