I really hate black and enjoy natural bathrooms. You can add colour in various ways, including towels, accessories. And change the accents as you get sick of them. I've never got over black baths that existed in my childhood (and looked dated then) - too dark for most spaces and show up soap, powder etc far more than natural tones.

yes. stallion looks like it is in a sample hanger with all or most of the various colours available. your other photo with the 6 or so swatches looks like all warwick samples. The Bleecker pleat does look interesting. I haven't seen it in Australia. Just remember any 'different' headings will substantially increase your making cost. Making cost is usually not unreasonable in Australia in my opinion as we have regulated wages etc. so making will change depending on how much labour will be involved. the most 'flexible' cost with curtains is your fabric as fabric cost can have a very wide range as you have no doubt discovered. but the making cost is the same whether the fabric cost $25 per metre or $250. the labour is the same.

Grey and cream go nicely together so maybe go softer paler shade of house “yellow” (ie warm white perhaps natural white) and perhaps basalt as think gutters are deep ocean and basalt more neutral Grey or ask body corporate what colours are and google matching colours

Before space looks like a palliative care ward or a visualisation to the term 'dead dream'. Love the new space, complete new life!