Step 1: Create a new Illustrator document 460px wide by 230px high with the color mode set to RGB color.

Step 2: Select the Ellipse Tool (L) and click anywhere on the art-board to bring up the Ellipse Tool dialog.

Step 3: Create an ellipse 5px wide by 25px high and set its color to dark gray (RGB 127, 127, 127). Center the ellipse both horizontally and vertically

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Step 4: Once again select the Ellipse Tool (L) and click anywhere on the art-board to bring up the Ellipse Tool dialog.

Step 5: Create a smaller ellipse 7px wide by 7px high that is the same dark gray color. Center the smaller ellipse both horizontally and vertically on the art-board.

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Step 6: Add the two ellipses together by Option-clicking the Add to shape area button on the Pathfinder palette.

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Step 7: Add a black (RGB 0, 0, 0) stroke with a weight of 0.625pt. Pull up the Appearance palette and move the black stroke behind the dark grey fill color.

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Step 8: Create a duplicate copy of the dark gray shape (Command C) and paste it directly in front of the first shape (Command F). Change the fill color of the new shape to light gray (RGB 191, 191, 191) and remove the black stroke.

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Step 9: Offset a copy of the new shape to the right.

Object > Transform > Move (Shift + Command + M)
Horizontal: 0.75px
Vertical: 0px
Make sure to click Copy instead of OK

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Step 10: Subtract the second copy of the light gray shape from the first by Option-clicking the Subtract from shape area button on the Pathfinder palette.

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Step 11: Select all of the shapes and group them together (Command G) to make one easy to handle object.

Step 12: Rotate the grouped object 45.

Object > Transform > Rotate
Angle: 45

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Step 13: Shift a copy of the newly the rotated object to the right.

Object > Transform > Move (Shift + Command + M)
Horizontal: 40px
Vertical: 0px
Make sure to click Copy instead of OK

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Step 14: Select both objects and move a copy of the down.

Object > Transform > Move (Shift + Command + M)
Horizontal: 0px
Vertical: 40px
Make sure to click Copy instead of OK

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Step 15: Select all four objects and move them once more.

Object > Transform > Move (Shift + Command + M)
Horizontal: 20px
Vertical: -20px
Make sure to click Copy instead of OK

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Step 16: Select all four of the new objects and reflect them vertically.

Object > Transform > Reflect
Vertical: Selected

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Step 17: Finally select all eight object and drag-and-drop them inside of the Swatches palette to create a Swatch Pattern. Once you have the pattern as a swatch you can apply it as a fill or stroke to any shape object inside of Illustrator.

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