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Just pick a theme that utilizes three columns. I have two free themes in the market place that use 3 columns.
First: Black Accents
Second: Grunge Columns
You can see what they look like here:
www.www.rynomediaonline.com/concrete5/black-accents...
and
www.www.rynomediaonline.com/concrete5/grunge-columns...
there are other options available as well.