Solar with batteries and stuff.
Pavers in the backyard.

I tend to do some things myself, so it's not just about money but also about time and energy.
Although, I guess, in a way that's still about money since I could hire it out, just that cost is prohibitive and we chose not to.
The quote for pavers was something like $65 per square foot, which is simply insane.
I'll do them myself eventually, but I'm procrastinating for now.

Otherwise, it's an old house so there's always something.
It's now fairly well insulated, which means one of the next projects is to put in an air exhanger. Sigh.
That's not that big of an expense, but there's been a few other big projects, so I've been procrastinating about that one too.