All are fantastic in colour, IMO. When I looked at them, it never occurred to me that they might look better in B&W, as I was just enjoying them as they were. I think, in the case of the graffiti pics, that B&W would not do them justice. Some of the other pics might work in B&W, but if the colour already works well, there's not much point changing them to B&W, unless it significantly improves the picture, which, in this case, I would doubt, as the pics are already fantastic as they are. However, that being said, subjects of dilapidated structures do tend to lend themselves well to B&W/sepia, so...