From what €URO said, I have another idea for an easter egg, for 173.
My Idea: If you can ever view the moon/sun in the game, add a way to trigger it into SCP-173. You'll just have to see the image to understand.
How it can/would serve a purpose: Again, what €URO said, meme purposes.
Why I think it should be done: Meme Purposes
How it can be done: I'm not really sure how it shall be done, but.. um.. y'all can figure it out. Maybe you can spill a drink on 173's document and it will anger the Peanut gods, and they will look upon you and judge you.
bow down to the holy nut