SlideMagic was approved by Unsplash for full access to the API, no more hourly rate limits for searching images. Thank you!

Version 2.3.9 of the SlideMagic desktop app also offers a more minimalist image search interface. The selected image gets put straight into your slide, in a proper grid so that it always lines up with the other elements on the page. In the app you can zoom in or out, and move the image (inside its container). The image credit also gets placed in the footnote of the slide (not required by Unsplash as it is a remixed image, but still nice to the photographer, the main obstacle for crediting images I think is not that people don’t want to, but it is a hassle to find the details and put them in your designs).

Hitting an empty search returns a set of random images (because I could :-)).