Default marks are in /marks/ folder.
Other color variants are at https://hub.analythium.io/assets/logo/:color:/logo.:ext: where :ext: is svg or png, :color: can be any of the following strings: {{ pal.join(', ') }} (see listed below and in this JSON file, colors are also stored as objects).
Changing the default stroke (stroke color is dark color of the palette) can be done as https://hub.analythium.io/assets/logo/:color:/:stroke:/logo.:ext: where :stroke: is none (stroke width 0), mid (stroke color is mid color of the palette), or light (stroke color is light color of the palette). Replace logo.:ext: with favicon.ico to get corresponding favicon.