This was a plugin script circa 2014 (inserted via yet another plugin, Gryphonheart Items ), that allowed players in World of Warcraft to trade drawings with each other as in-game items. The stored drawing was an array of coordinate and texture data, a hybrid raster and vector approach, because there were no methods available via the plugin API to get actual image data, I could only record mouse movements. The end result was pretty novel, and some artists spent some quality time with it, doing portraits. Here's Tarhoof's portrait gallery.
Later I went on to make a web version. The backend is glitchy but the frontend drawing functionality is intact.