If you like using minima white, minima black, solipsus design, Ms. Moto and another blogger standar layout in 3 columns. Just Download it for free.
I found it this site and try it and also it works.
Just Download 3 Columns Blogger Templates Here
If you are using these templates you will not able to put an image into your header template. That's is different using the templates. Anyway, why you don't try it first, maybe you'll like it?? :)
3 Columns Blogger Templates