One of the more popular custom avatar maker sites in a varity of styles.
A web application and an API which generates randomly generated pixel monsters in SVG format. It can be used to create profile pictures. Has a REST API: https://pixelencounter.com/Api
2 requests per second, 10000 requests per 30 days per IP address.
Libravatar is a service which delivers your avatar (profile picture) to other websites. If you create an account with us, your photo could start popping up next to forum posts or blog comments on any site where you left your email address.
This service is powered by Free and Open Source software called ivatar. With this software you can also run your own instance and serve avatars yourself.
Can also generate pixel art avatars of several varieties.
Source code: https://git.linux-kernel.at/oliver/ivatar/
The collaborative, web-based, massively multiplayer game Glitch began its initial private testing in 2009, opened to the public in 2010, and was shut down in 2012. It was played by more than 150,000 people and was widely hailed for its original and highly creative visual style.
The entire library of art assets from the game, has been made freely available, dedicated to the public domain. (CC0)
Pagan hashes input strings to generate unique avatar images intended for use as profile pictures in web applications. These images can be used to replace default user images for new accounts, or to enhance comment sections by visually representing a user's IP address or username as an 8-bit-like character sprite and not a random blob of pixels (ala the drunken bishop algorithm).
Classic video game sprites of all kinds can be found here. They make great icons.
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