Graffiti

Right-clicking anywhere with the pen marks a drawable area, and a second right-click opens a text editor. Shift-right-clicking air switches the pen to a free drawing mode in which a right-click paints directly onto the surface. A second pen can be held in the offhand and used with a left-click, so drawing can happen with either hand.

Each block space supports up to six canvases, which lets a single surface hold several drawings. The Canvas Editor modifies a drawn-on block after it is placed. Pens are crafted from dye: a black pen is started by placing two dyes of the same colour side by side, and the pen carries 16 dye colours plus three extra colours that Minecraft text codes do not provide. Drawings can be exported as a JSON file placed in the Minecraft directory, and that file keeps the pixels, text and other details of the art.

The mod is a Forge build for 1.15.2 and runs on client and server, so both the server and every player need it. Only survival mode allows drawing. Performance with many graffiti blocks in one area has not been fully tested, and the author expects larger canvases to add loading cost and possibly lower FPS. Issues can be reported to the author.