iImage Information

I've seen a few guides on here on how to make wood grain but I didn't feel they looked like wood enough. This technique was learned about 5 years ago and I've never forgotten it. Hope you don't too. :)
This technique was made in Photoshop CS2. I tried to make it in The Gimp but I couldn't find the same filters needed. If you can do it in Gimp, I would love to know.
Step 1Open a blank window
iImage Information

Lets start off by opening a blank window of any size u want. I used 800x600. Then, change the foreground and background color to a dark brown and light brown color.
I managed to do it in GIMP with very little effort actualy.
I used the Distorts->Ripple filter (period=108, amplitude=75, threshold=0) and ran it 5 times. (I also used colorize to get right color)
Here's my result.