I build a digital picture frame using an 8-color e-ink display and a pi pico.

It works great within its limitations, but the limitations are still pretty big

• 8 colors is pretty limited, especially when it's a specific 8 colors (not just 8 max).
• Refresh times are slow
• The pico memory and storage are limited
• Due to the above, mine ran in two cycles with a reboot between to clear memory. One to pull images from my website and another to cycle through existing pictures until it needs to grab more
• Images needed to be converted to the appropriate size+ 8-color palette and dithered etc beforehand into a format the pico can read (hence then being on my website where they were reduced to an uncompressed palletized BMP)

Obviously a commercial product could probably do better, or a better screen, but faster-refresh or higher-color tends to jump in price quickly.

Still, it was pretty cool to have a device that would not need power to persist images, and used only a little during the process of loading new ones so could be powered by battery/solar