This is a texture editor for a future macroRenderer version that supports textures out of the box. You can change the brush color by clicking "Set RGB" or setting the individual color channels, or just using the eyedropper by clicking the dropdown above the Set RGB button. You can set the size on the dropdown on the far right of the toolbar. You can save, load, or clear the canvas with the buttons on the menu bar.
macroDrawer by cellulose3D This is completely free to modify, as long as you give me credit! - Vallen This project uses flexiGUI 4.0 https://scratch.mit.edu/projects/1273313252/