I think this is already possible - search for "Logo Component" on this page: https://github.com/webbukkit/dynmap/wiki/Component-Configuration You will need to set "logourl" to show a picture, like in this example (for pictures stored on your server): logourl: "images/block_surface.png" or, for pictures somewhere in the net: logourl: "http://somedomain.com/somepicture.png"