Which room are you changing up... Bedroom? Can you post a picture of it!

@miacometlady thats the problem I'm not there now and its my bedroom :)

I did a wall along the lines of what you are doing for my daughters room recently. The colors I used in the art were neutrals with a punch of red using all black frames.
I framed a beautiful photo of a zebra, a piece that I made myself using paint chips and a circle punch (it mimicked a pillow I have in her room). Then we framed a saying that was meaningful to her, a red welsh dragon decal a large metal S which our last name reperesents.
I guess I'm telling you this in detail because I think it's nice to frame things are are meaningful. Another idea is to frame some beautiful wrapping paper, scrapbook paper or fabric.
Letters are great too, you could use metal or decoupage one.
Hope this helps in some way.