Hi Earla, do you mean after taking the TV down? There are lots of Hometalk projects with neat ideas for walls....
What are you trying to accomplish?
Can you post a photo?
You could paint it with a contrasting color. You could add fabric to the wall with liquid starch. You could use removable wall paper, peel n stick, that comes in many textures and designs..... Amazon has a great selection.
You could hang several pictures to make it a gallery wall.
Scroll through some of these ideas and see if something catches your eye:
Here's a great solution: https://www.drivenbydecor.com/how-decorate-pictures-above-tv-stand/