how to get the page and blogpost icon on a custom email tempalte

[Akshatha]

I am developing a code to send the email based on some event in confluence using script runner plugin. I am using the same format as default confluence email, but I am not able to fetch the page icon.

Has anyone included 

https://developer.atlassian.com/server/confluence/icons/

or https://docs.atlassian.com/aui/7.4.0/docs/icons.html in groovy script?