This was not the Blue mosque. It was an old Byzantine church but now converted to a mosque and is plastered with gorgeous blue tiles from Iznik, a city some distance away from Istanbul. This reminded me of the Blue mosque in Cairo which still had some surviving blue tiles that would old and beautiful. Like most places in Istanbul, this was difficult to locate which makes me think, I might have been better off if I had hired a local guide for Istanbul. These tiles makes for a good subject for painting. I've made a few paintings of them and they are so delightful, if I may say so. I'll show it one day.