Choose Paint > Effect Brush > Clone Brush .
Click the region of the image you want to use as a source texture.
Click or drag anywhere on the image to apply the source texture.
As you drag, more of the source texture is applied.
To select a new source texture, hold down the L key and click the source texture.
To resize the Clone Brush, hold down the R key and drag:
up to increase the minimum radius
down to decrease the minimum radius
right to increase the maximum radius
left to decrease the maximum radius.
To adjust the Clone Brush opacity, hold down the O key and drag:
up to increase the minimum opacity
down to decrease the minimum opacity
right to increase the maximum opacity
-left to decrease the maximum opacity.