With this program you can press space and draw with your mouse. Press the green flag to erase
If you do decide to remix you will find a sprite called drawing if you press "show" you can go to costumes erase the original sprite, draw you own pattern, and run the program. Do this and it will be drawn on the graph, and then you can press hide to show just the pixelated version. You can also go to the sprite "grid" and change the color to change the color of the drawing space. Thank you Griffpatch for the tutorial