(edit - this is NOT my project! ) Here’s one for the folks who say we need more multi-disciplinary projects!
Saw this today on Reddit. Homebrew smart watch, with 3d printed case, DIY circuit board. You could also DIY a leather watch band. Author has links to GitHub repository with code and BOM for the PCB.
Tagging @Team_Electronics in case someone wants to give it a go from that end as well…