I use Ansible to manage several of my personal computers. Most
interesting might be using it for my workstation, currently icarus.
Those playbooks are split into two parts, icarus-system (for
root-managed things) and icarus-walters for things that just affect
my home directory.
For example, I also use Ansible to set up my ~/.ssh/config and
/.gnupg/gpg.conf.
There's a lot of random but generally useful things, such as configuring libvirt to not ask for passwords, installing CA certificates for my employer's internal CA, stronger ssh and gpg defaults, etc.
Someday I may document some of these things more, but for now, browse the source. And if you know of any, please send me links to other people doing the same thing as this.