You can clone an area of the texture (duplicate it) and then paint that sample elsewhere on the texture or on other textures. There are two cloning approaches: dynamic and static.
With dynamic cloning, the clone source moves as you paint. In the following DynamicClone example, a small area of the top eye was set as the clone source. Painting below the eye gradually reproduced the top eye. In the StaticClone example, the pupil was cloned and stamped.
To clone an area of the texture and paint with it
The brush outline displays an X across it when you move the brush over the surface to indicate that you are unable to paint on the selected attribute texture until you set a clone source.
Maya automatically selects the brush profile selected when you last used the Clone operation. However if the last profile was a custom brush, the operation remembers only that it was a custom brush, not which custom brush. Changing the custom brush for one operation changes it for any other operation with the custom brush profile selected.
By default, the Clone Brush Mode is set to Dynamic. With dynamic cloning, the cloned area changes as you paint, moving alongside your stroke and maintaining a constant distance from the stroke path. This is an effective way to copy areas from existing textures.
Select Static to keep the clone source stationary.
If you paint over the clone source during a stroke, the original paint sample is used for the rest of the stroke, but the next stroke uses the updated clone source paint sample.