There are a couple of different ways to do this technique - one is called Milk Paint Technique from Technique Junkies (techniquejunkies.com or patstamps.com - a GREAT technique website/subscription) and here's another way also from SCS Challenges
Forums at Splitcoaststampers
The Milk Paint was a free tutorial on Pat Stamps, but I don't see it there anymore. Here is the link to when it was a scrapbooking challenge
Forums at Splitcoaststampers
Basically it's dtp with craft inks, one tone of the paper, and the other layer is vanilla. Add plank lines and nails with pen.