Your blog needs is a face (design and layout). The design of your blog can be easily changed with the Themes. You could select a theme that is more unique to your blog and compatible with your niche. Choose a theme that looks great, but also works for your unique content needs. Your readers will first notice the overall appearance of the blog, before even taking a look at the content.
Once you install a theme you like, don’t be surprised if it doesn’t look quite right. Your theme is just a skeleton of your blog. To make it appealing, you’ll have to fill in content (text, photos, videos, etc.).