Painting woodgrain on a small staff is not so hard... just paint it with GW Bleached bone or Vallejo Sand (or anoter light color you like) and then draw many vertical lines using a brush with a good tip and a dark brown color (like Vallejo Mahogany brown)
When the paint is dry add some wash using inks (GW Flesh wash or GW Chestnut brown) all over the staff.
You can also leave the ink dry and then add some more shading with a second (third, forth....) wash.
Here\'s a couple of examples from my site:
you can see this Orion also here:
http://www.coolminiornot.com/4206
this is a Warhammer Imperial gunner I have painted for a friend, sorry for the shining finish
Paolo