What about something groovy like one of these? It has probably been on one of those fantastical "reality" renovating TV shows, but just such a funky option for a low ceiling - or as a wall feature :) I think Beacon and/or About Space had a variation recently??

To assist with harnessing the sea breeze suggest a beautiful long narrow feature window that follows either side of the pitch of the roof (which will let in a lovely sky view plus breeze), or just have the top triangle as a window. Understand the desire to have the small window there however in a room with big glass/window features, the small window looks like an after thought and is at the wrong scale.

I selected Neither - Reason. I think that particular room looks great because a huge amount of expense has gone into making that room picture perfect. It is unrealistic to think that the average home buyer / owner will have that kind of money to invest in a room. Generally I would never put wall paper on a ceiling. The only thing that has made this room work is that they have been able to invest a lot of money into making sure this room is "show room" quality by matching the paper and the carpet and all the furnishings. It is not a homely room. It is a room for a palace or for the rich and famous. You could not relax in this room and I do not think the average family would ever allow their family to use this room - most of us do not have "special occasion" rooms.

Without seeing the design and construction , one possible idea that I have done in commercial buildings , is to get some plywood , say 800 x 1200 , cut 4 or 6 or whatever holes in it , insert LED downlights , take them back out and stain it or even paint ( charcoal is a logical one , but you could go as wild and crazy as you want -- bright red mightn't suit everywhere , but will suit some decors ; same with peppermint green or metallic blue or silver or yellow . You can hang on stranded wires anything from 10cm to 100cm or more from the concrete ceiling , makes a fake ceiling . I have even done several over a larger area , all at different heights and different colours and tones , and it adds even more interest . Maybe $200 a 'drop' , and it even hides the worst of the wiring , quick and easy and even slightly trendy , and probably even fits the Aussie inspired theme !