The roof is done with RK and covered with fondant squares, but blended to the cake so it could be removed and the cake sliced for serving. I borrowed this idea from someone else and since it was a huge 10" cake there was no way I was going to try to put it up as a tower, so I just did the tower top! The layers inside the cake were also tinted to match the pink, blue and lavender shades of the cake.