Texture
Paint: Paint tab
Note:
Painting
the stencil with white makes it transparent so you can see the mud
texture under the grass. Use Subtract to erase.
3D View menu >> Mode box >> Texture Paint
Buttons Window menu >> Editing (F9)
Paint tab:
Draw button enabled
Brush Color: White (R: 1.0, G: 1.0, B: 1.0)
Brush Mode: Add