It is a great idea to learn about all of the kinds of free blogging tools that are available so that you can make an informed decision about what to add to your blog, but try to remember that just because you can have something doesn't mean that you need it. Practice restraint and only choose the options that you think will really be useful. If you can find out how many visitors are reading your blog by checking your traffic statistics, a visitor counter is likely to add unnecessary clutter to your page. If your blog is text-based, a flashy background can be more of a distraction than a benefit.
Be realistic about assessing what kinds of blog accessories will help you realize your vision and improve your site. Remember that even a blog tool that doesn't cost you any cash may not be an asset in the long run.