I wanted something no-frills that isn't a bloated commercial option, so this is that. Open source, but also on the Play Store for convenience: https://play.google.com/store/apps/details?id=com.minosapps....

It (optionally) injects the current time, current location (city and country name only, using coarse location access) and current weather into the prompt, so you can easily get a night scene with rain in the evening, and blue skies at noon.

API access is handled via Bring-Your-Own-Key, so no subscription option or anything. Just copy in your own API key.

There are some presets to get you started, but best experience is using your own prompts.