To have a better look for your blog or to have 3-column blog templates you need good template resource from where you can download the template and use it free for your blog.
So here I am mentioning free blogger templates resources which you can use. Personally I like 3-column blog templates because we can add more page elements including more google adsense ad units. I have selected these resources based on following criteria
1) They are suitable for different blog topics. Their look is good and professional.
2) There are 2-column blog templates and 3-column blog templates.
3) Some of the templates are SEO friendly.
4) Some templates has facility to add google adsense code into post body.
This templates are for blogger/blogspot users. I will add resources for wordpress users later.
I will keep updating this list. If you know any good resource for blog templates please leave a comment here .