Consider mentioning your little personal scripts to your co-workers

I have the habit of trying to automate the small stuff, things that are regular occurances most people don't think about, a lot of my early career actually centered around this. It started off sharing snippets in Excel that made everyone's life a little easier which then progressed to Bash and Python scripts that helped teams manage their machines and systems.

I agree with Chris, that writing a Wiki entry or README in central repository usually won't end up helping most people immediately, however I've seen random colleagues end up searching internally for solution that might stumble upon something I've written. So I guess, it helps somewhat. Although sure fire way to help is mentioning these little scripts when they're most useful.