Adobe Illustrator CC 2015 - Manual (Page 228)

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Painting
Last updated 6/5/2015
9 Paint the geometric objects the desired color.
10 Save the geometric objects as a pattern swatch.
Construct irregularly textured patterns
1 Choose View > Snap To Point.
2 Draw a bounding box. If you are creating a brush pattern, skip to step 13.
3 Draw the texture with the objects or lines that intersect only the left side of the bounding rectangle.
4 Using the Direct Selection tool, select the texture and the rectangle, and place the pointer on the lower left corner of
the rectangle.
5 Drag the rectangle to the right; then press Alt+Shift (Windows) or Option+Shift (Mac OS) to create a copy and to
constrain the move.
When the upper left corner point of the copy snaps to the upper right corner point of the bounding box, release the
mouse button, and then release the keys.
If you know the exact dimensions of the bounding box, you can select only the textures and use the Move command
to specify a horizontal move the width of the rectangle. Be sure to click Copy instead of OK in the Move dialog box.
6 Click outside the rectangle to deselect it.
7 Select the right rectangle, and delete it.
8 Continue drawing your texture with only the objects or lines that intersect the top side of the rectangle.
9 When you finish with the top side only, select all of the lines or objects crossing the top side and the bounding box;
then press Alt+Shift (Windows) or Option+Shift (Mac OS) and drag downward to create a copy and to constrain
the move.
10 When the upper left corner point of the copy snaps to the lower left corner point of the rectangle, release the mouse
button and then the keys.
11 Deselect everything.