Pixabay
You can integrate the stock image cloud pixabay into an image input field.
To do this, you need to enter an API key in the parameter.
To get an API key, you have to sign up for a (free) Pixabay account and then go to https://pixabay.com/api/docs/. You will find your personal API Key under "Parameters".
Copy and paste the API key into the parameter setting of your image input field.