Make a brush http://er4o.org/gallery/949e2909ad884484924d1279ffe3bcc1.JPG Now mark the brush and press the Texture application tool (SHIFT+A), a window will appear.
Look at the left upper corner you will see the word "scale" http://er4o.org/gallery/f710e5e244cbceaaac79142e43e86336.JPG I choose 3 for X and Y and this is the final result http://er4o.org/gallery/c237a4a7e55812b56a3cbdc0f91e666a.JPG
It's good to give the ground scale to 3 MAX or it will look bad.