our link.we can make it as we want.
You can create some image.make sure its square image.
Layout > Edit HTML and expand Widget Templates
2. Find this code by using Ctrl+F <title><data:blog.pageTitle/></title>
3.After You can see like this code.
<link href='your ico file URL' rel='shortcut icon' type='image/x-icon'/>
4.Now you have to make 16x16 or 32x32 size image and upload to hosting site and get a link.
after get the link put that link in your ico file URL area in above code.
5. After finished it save your template.