Flowers always work

Colorful flower arrangements and attractive potted plants can do wonders for plain rooms. Vary the sizes and textures. Avoid a lot of small pots and plants - they make the room look busy and cluttered.

Bookcases are good areas for staging.  Remove a large number of books if the case is full. Go for the sparse look and then add a few accessories. They can be a small print on a tri-pod frame holder; piece of statuary or something that ties into the theme of the home. No collections should be displayed, they distract the buyer.