You mightiness convey seen examples of rough.js floating roughly on social media this week. Rough.js is a novel sail based library for creating graphics which convey a sketchy, hand-drawn appearance. The library's github page includes a great d3.js present map inward which each of the states has been filled inward alongside a unlike hand-drawn style.
Rough.js doesn't entirely last alongside static maps. Because the library is sail based y'all tin too overlay hand-drawn, sketch similar polygons on last yesteryear of an interactive map. At to the lowest degree y'all tin if y'all role the novel Leaflet.RoughCanvas plug-in for Leaflet maps. The plug-in allows y'all to add together polylines as well as polygons to a Leaflet.js map which convey a hand-drawn style.
Here's a demo map which I created using Leaflet.RoughCanvas alongside a Mapbox styled base-map.
