An idea I had this morning, when I work on a big tower. Building in RW take some times and lot's of materials. So when I have build idea in mind, I don't take too much time in exploring, because "I will waste building time". Some times ago, we discuss about loots in dungeons chest, and I think that finding 2-4 stacks of stone in a chest could be rewarding for builders. It's basic stuff, but I'll take it ! And it can be a building rewards witch can help you in you creative builds and rewards you for the time you spent "out of work".
My 2 cents