you are looking for free Drupal themes that will go with your blog, there are a few things that you will need to consider. Is your blog dedicated to one niche? Will you need to look at different designs because you constantly change what you are writing about?
If you are writing a travel blog, then you need a theme that will match that. Look for one that has pictures of landscape or has a nature style. Danland is one of the most popular for travel blogs when it comes to Drupal. It has a beautiful and elegant theme, which is simple to navigate around and has pictures perfect for a nature or travel theme.
If you want something that is more for an artistic blog or something that will show off your own style then you should consider BlogBuzz, which is just full of color and style. You can make it as bright as you want or stick to more natural and neutral colors.