This is a great thread.
OP, if a daily self-portrait is too onerous (it would be for most people), how about weekly? Anyone should be able to manage that, but creating interest is still a tall order.
- Do you have any animals? They're easy targets.
- Spend a week with a single lens on your camera, only shoot with it. Next week, another lens. Or shoot at one focal length for a week if you only have zooms. Shoot black & white for a week.
- Do you have a macro lens? A macro mini-studio is something I'll be trying. There was a cool shot of someone's homebrew studio on this board somewhere (a couple of flashes and a frame with a sheet over it?).
- A fisheye lens is a lot of fun. You can shoot almost anything with a normal lens then do some fishy versions. The 10-17 is especially good for adding variety with its various focal lengths.
- Wildlife photography is a rush. It taps into your limbic area's hunting instinct, but no creatures get hurt.
I love shooting farms and barns. If I lived in a rural area I'd try various compositions of all the ones within driving distance. Maybe there's some other type of architecture that interests you?