Large window dressing ideas

[Catz]

Any suggestions/ideas about what to do re window coverings with the window pictured below?

I have a couple of ideas but am hoping there's someone on here with more "vision" than me.
The window used to have curtains but they came across both outer quarters of the window and (imo) spoilt the whole effect of having such a large window. Not bothered about the upper triangle being covered. We're not overlooked but I feel the window does need something.

There is also a window opposite this which is fairly big so I need something that would suit both windows. Or can I do mix and match??

Thanks