I would paint them the same colour as your other doors and trim.

Paint them the wall color at the least. Entry doors should be trim color but these should disappear. Why 2 doors near each other?

I’d paint them.

I would paint the same as your walls, and like the idea above about putting art over them, so they are not noticable, unless you have to open them.

Yes, same color as wall. The one over the desk could become a corkboard for notes etc.

As another option, repurpose the opening for an additional function This wine rack hides access to an exhaust fan - if necessary after removing the tiles, two screws retain the box Or, let the trim become framing for art - a poster can be wallpapered onto the door