What colour should I choose for the feature wall?

What should I paint the feature wall?

So I’m almost finished this room after working on it for the past few months on removing the original varnish, and sanding it back. Painting etc.

The wall is currently a painted textured wall, from memory they used a sponge to create the effect.

I want to repaint. I was originally thinking of like a geometric design with a few different colours but wasn’t sure if it would match. But I’m open to suggestions.

The grey walls are staying and there will be navy blue blackout curtains as well.