This is just a custom block for drawing a pen rectangle. The block is: Draw rectangle at x: (x) y: (y) pen size: (pen size) width: (width) iterations: (iterations) - x, y: The coordinates of the bottom left of the rectangle. - pen size: The size of the pen. Smaller size causes less corner rounding. - width: The width of the rectangle. - iterations: The amount of lines of length (width) to draw on top of each other, spaced apart by the pen size. (iterations) * (pen size) = the height of the rectangle.
All code and the sprite by me.