Unlike the mandalas, these are pictures rather than patterns: a jack-o-lantern, a snowman, a gingerbread cookie. Each is a single drawing rather than one point in a parameter space, which is why there is no generator for them.
Every one was traced to closed vector outlines and checked before publishing, so a fill tool cannot escape into the background and the lines stay crisp however large the page is printed.
Each drawing is composed in code from circles, arcs, capsules and closed rings, the same way the mandalas are, rather than drawn by hand or licensed from a stock library.