Old kindles are a lot of fun. I've turned a couple of them into AI generated paintings that refresh their contents every few hours or so. I can control the prompts via web-ui, through template functions they can include things like weather conditions, random animals, countries, current date & time and even titles of random news articles. Prompt handling and image generation is done completely locally on my home server, using ollama and stable-diffusion-webui.

The only problem I've had is that most news articles from mainstream media are damn depressing, so generating paintings directly from them gets gloomy quick. I had to instruct ollama to try put a positive spin on negative articles. I do love my weather-forecast painting though. Whenever it's raining outside, the painting has rain in it too (or now during winter it's all snowy).

Battery life is really good too, lasts several weeks. I used existing "Online Screensaver extension" from MobileRead forums, with some customizations. It automatically turns on airplane mode after fetching the image and keeps it on until next fetch, which probably explains the improved battery life.