The Stencil is a block from the OpenBlocks mod. This block is used to paint specific patterns onto blocks, such as Sandstone, Glass, Stone, and Canvas. These are created using the Drawing Table, and are made of Unprepared Stencils. There are 15 different styles of stencil carvings. Stencils can be found in chests in Dungeons and Abandoned Mineshafts.
After being placed onto a face of a block that can be painted, it can be traced with a Paint Brush.