Blogger Layout templates, especially Minima, are still famous among the designers and developers as it can be highly customized. But Blogger don't have default three column layout Minima templates. So I have made two Minima Blogger templates with three sidebar columns for tutorial purpose and for those who want to make their own templates from the scratch.
Download Minima Template with Sidebar to Left
Download Blogger Minima Template with Sidebar to Right
Also don't forget to have a look at three column blogger template tutorial for Layout (XML) tempaltes.
