Thank you to all for the wonderful feedback. I didn't intend to paint the walls blue rather a taupe/brown - the De Sousa home is a great example. Since publishing the photo and the question - I have viewed many fabrics in many shades of blue and came to the conclusion blue is probably not the right choice. The photo looks beautiful but have moved to silver/grey with plum purple walls. But keeping the padded bedhead with demi lune side tables, an occasional chair in far corner and I already have the perfect bedside crystal tired lamp bases already. Again, could go very wrong with purple but I think I've found the perfect colour here in Australia. There are some stunning fabrics available in the silver/grey tone and I think it would well in the bedroom. The starting point funnily enough in moving to silver/grey was stumbling across the most gorgeous drape fabric. Then I built the rest from there. Now it's down to making final selections. A frustrating but fun process. Can't wait to see end result. Fingers crossed it all works out! Thank you once again - this site is amazing and your feedback is most helpful.

Try Dulux Windspray in half strength.

Taubmans chilly water (more green) or misty rain (more blue). i'm sure there was a design dilemma post from a while back that gave the Aussie paint answer to this question. Hopefully someone who knows will see this and link it.

We installed a feature wall of tiles in our bathroom of a similar pale blue-green colour to your examples. The closest dulux colour I came across was dewpoint. (Not quite close enough to be painted alongside the tile so we went with white for the non-tiled portion of wall so I can't show you a sample of it painted but might be worth looking at).