Images available under CC or Public Domain

OpenClips
bricks - https://pixabay.com/en/brick-wall-bricks-construction-wall-148012/
lightbulb - https://pixabay.com/en/bulb-icon-light-background-idea-1710295/
lightning - https://pixabay.com/en/lightning-bolt-yellow-red-weather-28003/
robot - https://pixabay.com/en/robot-mustache-science-mechanical-161367/