You can also put the same texture in another map channel and repeat it on a larger scale, possible even rotated.
Code:
tex = node.getTexture(unit=0)
node.texture(tex,unit=1)
node.texblend(0.2,unit=1)
trans = viz.Transform()
trans.setScale([0.2,0.2,0.2])
trans.setAxisAngle(vizmat.EulerToAxisAngle(0,0,45))
node.texmat(trans,unit=1)