Notes:

Source: My Photoshop and the Cookie Clicker website's source code.
Description: All of the grandma sprites in tech-tier order. It seems like the Pledged Grandma was supposed to be palette swapped version of the Portal Grandma so I decided to merge the two and what do you know they fit together like a glove. Pledged Grandma is now a bit more 'whole' now instead of just a floating head and a rolling pin that you'll usually see your Portal Grandmas turn into in-game when you pledged to the Elder Gods. (Though I might be mistaken and that was the intention all along.)

How to Get the Sprites Yourself
Just type these right next to the website's URL address:

/grandma
or
/<version>grandma

Simply put, typing their origin between "/" "grandma" will get you a different grandma.
For example typing "/factorygrandma" will get a factory worker grandma.
Typing just "/grandma" will get you Grandma Classic.