Step 4 Repeat the process to create the final side of the cube. The different shades of grey create the 3D effect.
Step 5 Group the cube elements and duplicate them twice to start to create the pattern. Start duplicating them until you filled the screen with cubes.
Step 6 Carefully select an area that will be used to define your pattern. Bear in mind that it has to be tileable, so use the image above for reference. Once you have selected the area, select Edit > Define Pattern. Name your pattern and go back to the design.