You’ll have to go with a theme that supports 3-column, and you’ll need the CSS Upgrade to be able to edit/apply your own CSS.
Most people go with the No-CSS Sandbox theme and make it look how they want. I’m currently porting the MIX theme from http://www.sndbx.org/ for use on the No-CSS Sandbox. Then, I’ll customize it to my liking.
If you don’t want to go through that much hassle, there is a 3-column Sandbox that you can use as a starting point and make it look how you want.
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