How can I fill in extra space around a microwave?

Patricia,

Where is the extra space exactly and how much space is there? Is the microwave mounted on a wall, in a cabinet, sitting on the counter?

You can put cook books in a magazine binder. A lot of this will depend on how much space you have. Also, what is your style?

A photo of the space would really help! Can you share one here?

Yes a picture would help so we can see how much space you have.

I have a vertical wine rack next to my, on the wall microwave. Underneath, I have a wine glass holder running across the area.