heres how: 1> make a new document white bg and make the hight 2 pxls and width 1 2> zoom in as much as you can and take out the pencil tool 3> then once you do that hid "d" on your keyboard so the forgrounds black and draw the top box black (the bottom should b white if isnt just color that in white) 4> now go to edit> defiy pattern and your done When you use it go to the paint bucket tool and click on pattern instead of foreground (and dont forget to make the dransparency sumtin like 50 axe