While the images on unsplash are fantastic, nothing about this, really nothing, is "open source".<p>e.g. quote from <a href="https://unsplash.com/api-terms" rel="nofollow">https://unsplash.com/api-terms</a> :<p><i>In connection with any Photos that you access via the APIs, you must directly use or embed the related image URLs returned by the API in your Developer Apps (generally referred to as “hotlinking”) in accordance with the API Guidelines. Additionally, each time there is a download of a Photo or other comparable event (e.g., setting a Photo as background wallpaper) in your Developer Apps, you must provide us notice of the event in accordance with the API Guidelines. Failure to do any of the foregoing in this Section 6 will constitute a material breach of these API Terms. You agree that Unsplash may track user views, downloads, and other interactions with Photos within your Developer Apps via the image URLs or other technological means agreed between you and Unsplash (“Photo Interaction Data”). Unsplash owns all Photo Interaction Data collected from use of your Developer Apps. Unsplash grants you a limited, non-exclusive, non-transferrable, royalty-free license to use Photo Interaction Data from each Developer App in connection with the operation and maintenance of that Developer App. You must not (a) transfer, sell, lease, license, sublicense, distribute, disclose, divulge, or make available the Photo Interaction Data (or any derived data or derivative product based on the Photo Interaction Data) to, or permit use of or access to the Photo Interaction Data (or any such derived data or derivative product) by, any person or entity other than your employees, (b) use the Photo Interaction Data to create, market, or distribute any product or service that is competitive with Unsplash’s products or services, (c) contest, challenge, or otherwise make any claim or take any action adverse to Unsplash’s ownership of, or interest in, the Photo Interaction Data, including the intellectual property rights therein, or (d) permit, procure, enable, or request any other person or entity to do any of the foregoing.</i><p>More stuff in there, including limitation of commercial use of the API etc.