I tried using Blogspot originally and found it impossible to theme for. Ended up with Wordpress, which may be overkill for what you want. Wordpress is super flexible and awesome, but to get the most out of it you need to do your own install on your own webspace. Tumblr sounds like a good fit for your project.
As for the writing, just focus on what you absolutely love, write the things you absolutely believe, and emphasize the things that aren't being said elsewhere. People like pictures, too.

