I have a big wall with nothing on it . I want to make a garden wall
You can hang pallets on the wall, line the sections with landscape fabric and then fill with soil and plant in them.
Indoor or outdoor?
Here are some great ideas for you https://www.hometalk.com/3160110/10-great-ways-to-dress-up-a-garden-wall-or-fence
Rocks or stone Home Depot has them you could add them and plant between them pretty plants leaving some stones out