The Pwinty Python SDK by Matt Gorecki allows API interaction, providing resources to work with orders, photos, documents, stickers, and errors. Pwinty is the photo printing API solution that allows to create photo prints, wall art, photobooks, and merchandise.
The popular picture-sharing empire behind I Can Has Cheezburger lets you view, caption and share funny images. You can do this via its sites and, the now, thanks to their API, you can do it via code (technical details at our Cheezburger API profile).
Gravatar is an attempt to allow users to have one globally recognized avatar. The service, around for several years, allows a user can set an image as an avatar and have it recognized on a variety of sites. Later, users can change an avatar once and have it change on every Gravatar-enabled site that they use. Though the service is somewhat well known, what is not is its robust API for developers to integrate the Gravatar service into their own sites.
These days everything from your mobile phone to desktop PC will most likely have an internet connection. This means you you can send an email, collaborate on a document or share a photo between almost any device using the myriad of web services that are available today. But printers are still stuck in a time when private networks reigned supreme, when it was rare that devices would be connected to the internet. This means printing a document from outside that network is convoluted process at best, and for most people it is just not possible. Google is looking to change that with Google Cloud Print.