Get out all of your old picture frames that have been living in your attic for years! All of them. It doesn’t matter if they are different shapes or colors or designs.
Remove the glass and backing (leaving just the frame) and spray paint all of the frames in the same color (I LOVE white, especially if you have a colored wall).
And…hang them up on the wall! There really isn’t a “wrong way” to hang these.
Now you have easily (and inexpensively) added dimension and art to your empty wall!