These are occasionally found in the Underdark, strangely enough... it seems to me that finding them and trading them in to the art dealer in the House of Trade might be a cool thing. It wouldn't have to necessarily emulate the rothe/animatron system and hand out XP, but a small sum of gold might be nice as they are "valuable", or perhaps eventually with enough paintings turned in even qualifying an individual to purchase work from the legendary Tannis...