I must confess I have a little weakness. Whenever I go on vacation, I make photographs of stones (walls etc) and of flowers. When I was in Rome a couple of weeks ago, I made photographs as I normally do and when I came home, I noticed again I had loads of photographs of stones and flowers. There is something about 2000 year old brick work that makes me happy, and the combination with flowers is just too beautiful not to pay attention to it.
Anyway, here are a few examples, all of them were made on the Forum Romanum and on the Palatine.