What do you want to do ? IMO leave it bare anything on it will bring attention to it.

I would leave it blank, unless you had a unique/interesting item that complemented your overall interior design and fit the space perfectly.

Nothing. Lower the chandelier though.

Nothing

The problem is not the wall. There is nothing to keep your eyes directed to the kitchen area.

Okay, maybe something. Do you live on a lake or in a boating area? A couple of pair of oars? You need to think out of the box here. Maybe a large tin fish, etc.

General rule: decorate at human level, and let higher realms of architecture be places for the eye to rest.