Been wanting to add imagery onto the boring white walls of my home, and I think I want to add some nerdy posters.
I assume you really mean around the home, rather than your workspace/lab?
If you really meant the latter, then the walls of my lab are full of storage shelves and equipment racks..... you can't afford to waste space with a poster!
But if you really mean the living space in your home, my pro tip is to avoid anything with too much informational text (artistic text is ok).
My preference is astronomical pictures, whether actual pictures from Mars rovers, Hubble or JWST, or fake AI generated galaxy collisions or Jupiter rise from the surface of Io.