For the first prompt: Space Junkyard.
Fully procedural with geometry / shader nodes, no image textures/HDRI. The satellite was modeled based on the time machine(FG204) from the Steins;Gate anime series. No other modifier(s) were applied to the base object (Suzanne) besides only geonodes.
geometry nodes overview
breakdown, showing mostly geonodes passes on the satellite (~1min gif):
