Paintings don't seem to work, but there is one , most beautiful and exquisite, work of art that you can get into your camp.
I think that the only change you can make to the camp is your statue, "The real hero of Baldur's Gate", which you can order from boney and stoney in the circus in Rivington. It is crazy expensive, but I really would recommend to buy it, firstly for narcistic reasons, just to embellish your camp with YOUR statue, and secondly because it also gives you a nice permanent advantage.
