shallow (almost like picture ledges)long shelves, maybe two spanning 2/3rds of the space. You could display plates, utensils, artwork, bottles or a collection of something.

No collections or bottles in a space that narrow. I would hang art work, pictures of loved ones or favorite places you've traveled to..

How wide is the space?

I had a similar kitchen in a previous house. My husband made a very shallow shelf, with rounded corners, to put on that wall and it was incredibly useful, just such a handy spot to put something for a minute when getting things out of the oven or refrigerator.

A nice large piece of art is all that wall can handle or 2 or 3 smaller ones , nothing that sticks out since it is a narrow space . Maybe post a picture of the kitchen since it appears to be very small

if you prefer a more traditional look, you could do a beadboard chair rail and hang a few framed pictures above it. or for a big statement, you could do a feature wall. either create texture with wood trim, or paint shapes.

also, what's on the other side of that wall? can it be torn down to expand the kitchen? or is there an option to cut a window? (such as a pass-through into a dining room, or a window to outside.) that will make the kitchen feel bigger and brighter.

or if it needs to remain a solid wall, can you cut into the drywall between the joists to create shallow nooks?

My little apartment kitchen is only 5 1/2' wide, with room for appliances on only one side, and very limited drawer space. I have a pegboard on the other wall where I hang utensils, strainers, even a cup for spare eyeglasses. It's very handy, and colorful.

Bulletin board...chalkboard...spice rack...pot holder collection...decorative..but useable ...trays...decorative pictures of vegetables or favorite recipes..calendar/appointment monthly schedule chalk board

A picture from further back showing more of the whole space will usually elicit more ideas

A wainscoting with a little trim at the top will help as an unconscious reminder to not get to close to the wall hangings as well

If you have children..this could be a sentimental art project for them....paint a horizontal line above and below an area where they can write their names and paint pictures on the wall.....a constant source for a smile when you are in the kitchen..maybe include lines for names and heights of each child or grandchild

I like the peg board idea..... Julia Child would be proud

also love the pegboard idea! Ikea makes one that's more designer-y and a bit more polished looking. you can get cool little trays, baskets, etc to go with it.

or you can paint a traditional pegboard.

Cant see the pegboard idea working on that wall...look sort of dangerous..with all those things sticking out into the narrow walkway...cute...but not practical..

Your space looks so narrow and with your back to that wall when cooking and opening the oven, I wouldn't want anything protruding from that wall at all.

Not knowing your style and art being so personal, it's hard to make meaningful suggestions, but I would get 3 large, colorful posters for that wall...there are so many choices, for all budgets.

these are all from Great big canvas and all of their art can be ordered in different sizes. I would go large and since it's in the kitchen and so close to the stove (cooking odors, steam, oil, etc would affect fine art), I might not even frame them or mount them, but hang with poster putty and replace when/if they need it.

You could also paint a very large part of that wall with blackboard paint and create your own art (you or your children or anyone) on it with colored chalk. It could be really fun, colorful and inexpensive. Although, you would always risk having chalk on your fanny from backing into it when cooking!