Reference code for my homemade Nintendo Switch ornament:
Plays animated gifs from the SD card using the bitbank2/AnimatedGIF library and TFT_eSPI display driver.
Wifi and other settings (time zone, debug log visibility) are configured via a config.json file at the root of the SD card. Firmware can be updated by putting a firmware.bin file at the root of the SD card, or over wifi by entering the credits screen (click the right button) which enables ArduinoOTA.