Unlike Facebook or Twitter, Google officially provides a Google Profile Button script to add it into Blog or website which is great part of honour for Google Plus.

Its very easy to add Google Plus Profile Button Into Blog or Blogger as its officially provided by Google+ Plus and we have to just copy/paste the given script into
our/your blog.
HOW TO DO THAT??

1) First of all go Google Profile Button

2) Now enter your full Google plus profile URL or ID and select the button size.

3) Then copy the below code and put on your blog where you want.

4) Thats it. Now you have a Google Plus button.

Here is my Button shown below as Demo. Also you can add me in your circle if you want.