I have always loved wooden houses and timber cladding of all sort, I was introduced to painted tongue & groove about 15 years ago by a designer friend and we used it everywhere, I still love it and use it on walls and ceilings. It works well giving warmth and texture to simple, otherwise uninteresting rooms and teh combinations are endless. Not a huge fan, generally, of large patterns on walls unless it is a very grand hand printed damask, Mauny, Zuber or De Gournay with a room to go with it, ridiculous otherwise.
There is a tendancy here, perhaps cultural to over-design, and whereas I do not belong to the minimalist camp, I do believe the success of a room is in the balance
of scale, proportion and what is appropriate to put in it.
Above pictures from Italian AD
No one does timber cladding quite like our american friends, make cladding not war