I've used Stable Diffusion in the past, but I find the UI not so great.
However, I've recently switched to Stability Matrix, which uses Civitai integration:
You must be registered to see the links
The best part? All free and based on your own hardware.
Here's some free samples (and yes, this is def AI slop, and getting limbs to look right is such a pain in the ass, but it's fun to experiment with what they can do. Especially as a layman

in this new world of AI).
Use Civitai to find good LORAs and models to use, observe the prompts other people create based on content that you enjoy on there, and spend a few hours screwing around...I'm really nailing these puns tonight.