Tumblr is a blogging system that unites blogging and microblogging in one, and in recent times it has become very widespread among lovers of web 2.0.
In Isopixel they have left us a link to a post where we found 60 very good templates for this type of (micro) blogs in case the ones that we offer by default when we register we don't like them.
But also, Tumblr offers us the possibility to modify the HTML code of the templates to fully customize it.
Download | Tumblr Themes