I’m really into Pico / RP2040 based projects these days. Mostly environmental monitoring type of stuff.
Pi Pico based Weather Station Project - Discussion / Projects - Pimoroni Buccaneers
This was fun to play with.
Pimoroni sent me this prototype to tinker with. =) - Discussion - Pimoroni Buccaneers
On the Pi side its mostly remote video surveillance stuff. Motion Eye OS on a Pi 3B+ or 4B. A couple are Pan tilt setups.
I have a Pi5 with NVMe, a Pi 400, a couple Pi 4B’s, some 3B+'s 3A’s and Zeros.