I think JS libraries such as gif.js and gifplayer.js can display specific frames of a gif. So possibly you could create an animated gif whose frames are your portfolio of images, and so you could retrieve n images using your lone n-frame gif image.
You could do that with blobs and client code...or use mjpeg movies...im not aware of multiple images as such though...itd be worth researching multipart mime types i think
Say you wanted to populate a social media feed... you'd need to dynamically call media. That produces a huge amount of requests.
What if you want to batch 10 images per request? Does anyone currently do that?