If artwork is not your option, you can always go for a large scale photo on the wall. It will be the central point of visual interest in a room.
Tip: It is very important to choose a photo that has the same color scheme as the room that it will be in. That way, it will fit perfectly.
This is something that you can actually make by yourself. You can choose any image and prepare it for a large scale printing. You can consult a graphic designer on this one too.
