While in Spoleto, Italy, this summer, I went to the Sant' Euphemia Church Museum (where Umbrian Serenades sang last year) and found myself seeing blue everywhere. Subject matter notwithstanding, the color has an otherworldly quality which induces introspection, especially when contrasted with gold. Interestingly, Indian Yogi's had their disciples mediate on it (see here).
These works reminded me why the Pre-Raphaelites were so enamored of this particular hue. I'm happy to have a dash of it in a small antique prayer carpet now lovingly draped over a chair in my living room.