If you want to make your Blog unique and more attrtactive then you should use your own logo image in your blog header.
To read and follow this tutorial you can learn How to add a custom logo image in any blogger/blogspot header.
What is Logo:
First I am clearing you about Logo. In sortly A
logo is a graphic mark or emblem commonly used by commercial enterprises, organizations and even individuals to aid and promote instant public recognition. A logo can grow a blog or websites looking. As Like as other websites; wordpress blog you can also add a custom logo in your blogger blog.
How to add Logo:
Step 1: Create a custom logo: If you can create logo then its will be easiear. But if you dont know then you can take help from your friend or can hire any designer.
Step 2: Upload the logo: You can upload logo from your page element of blogger dashbord. But its dont work properly if you use a customarised templates.
So what should to do? In this moment you will need to add some code in your blogger HTML part and its easy.