The range of ideas in this department is way beyond my website capacity, but here are just few examples that can be of inspiration. The boards can go from nice and fresh wood-through all the stages of time inflicted wear and tear, some real, some artificial created by special paint techniques and- beating up with hammer.
These are more traditional finishes, but there are several ways to make it a lot more interesting. Cracking paint, multiple layers of paint coming through and burnt wood are some of my favourites.
That is it from me, do not have much knowledge of photography, so I stick to my wood works;)