Between the ceramic canal tiles, the cement mortar and the concrete roof tiles there is plenty of scope for some interesting mosses and lichens to grow.
You don’t notice this when standing on the ground, but once you climb around the roof these things dominate the view.
And the corrugated iron roof likes to grow rust. Those are the Pyrenees in the background.
grasspunk.com 
Wow, pretty! Now if only there was a suitable teensy ruminant to graze on there, right? A very small goat maybe? 😉
If we could then milk the very small goat it would be perfect.
Great photos! The rust on the roof almost seems to be trying to spell out a message.
I wonder what it says? Replace me? Paul is dead?
Gorgeous shots! Your lichen is a work of art!