Normally, the topic of web design is not something we cover, but there are instances when it is very relevant to blog hosting. A properly designed website is more efficient and more accessible. Moreover, with some handy tools like Bootstrap, you can also improve performance and responsiveness of your blog as well.
Some WordPress theme developers are now incorporating Bootstrap into their theme frameworks, including 320press, which offers WordPress Bootstrap for free. It offers all of the features you would expect from Bootstrap as well as a graphical backend for easy configuration and customization within your WordPress dashboard.
Using Bootstrap for WordPress allows you to develop one theme that works equally well across multiple screen sizes, from desktop computers to smartphones. Bootstrap is for those developers who are concerned with performance and functionality first, but that is not to say that you cannot make it look good as well. Many sites offer free and paid templates that you can apply on top of it, and of course a web designer may also come up with their own graphical improvements.