[cranium]

I would say any itch you get during the day could be a 100k idea, but don't forget to search if there is a suitable solution. I think too many programmers want to code the wheel when something already exists. And if it's unwieldy to use, try to acquire the product and repackage it for a non-dev audience.

And look at https://tinyprojects.dev/projects, it has some 100k ideas (imho).