I like the concrete bloc walls. They are becoming quite fashionable today. I'd keep them in the natural concrete color or if they have been painted, a color paint that resembles concrete. The concrete walls give a hard and cold impression so I'd choose wood flooring for the floors. The combination of a warm wood on the floor and hard, cold concrete on the walls is a nice one. Brighten the space with colorful modern art.

Deep gray and all the other accents in silvery old wood and cream. This will add drama, allow the other elements to bring ion light and set off the concrete wall as a true feature. If you want light instead of drama, then go for a very pale beige stone. It will echo stone colours in both the concrete and rocks...

Wow! What an incredible view you have! I think you first need to frame it out. I would suggest changing out the carpet with hardwood floors with a worn or weathered look. Definitely get rid of the plastic and replace with white base moulding. Next I would paint the walls a color in the pale grey or grey/blue family. Next, I would suggest some crisp white sheers to frame each window. In the pictures, it looks like the Windows on the right are two windows wide. If so, I would also place panels in the middle of those 2 windows to continue framing the view. These are for decorative purposes only and not intended to distract from the view. It looks like there is a big space between two of the windows. I would locate a large architectural piece to place on that wall to add some interest. Remove all the small items from the window ledges. Finally, I would love a round table in that space. Good luck with your reno!

An entire wall of built-in cabinets and hooks and cubbies for your crafting stuff (and perhaps filing-type stuff and printer for the office). Take a good look at what you have and think about how best to organize and store it and what could be displayed to be pretty and what should be hidden behind curtains or doors. A fold down ironing board on a wall or back of a door somewhere would be great. A nice desk and filing cabinet for the office side... or perhaps a great big table in the middle under the window, wide enough to function for both of you facing each other? A nice curtain rod would make a big difference too. Preferably just about floor to ceiling. I'd put a splash of colour on the walls and keep the curtains simple, but you could go vice-versa too. Something like this: [https://www.houzz.co.nz/photos/modern-bungalow-phvw-vp~4999540[(https://www.houzz.co.nz/photos/modern-bungalow-phvw-vp~4999540)