@yaradria @michael_vvc just came across this (know its an old question) –
one way to do this is as follows

Make sure intro image is ON.
into 'custom HTML at bottom', you can add/edit the following script
(change '34' to relate to your homepage ID)
(add your image urls from media library into the var of images...

<script>
var images = ['https://yourwebsite.com/image-url', 'https://yourwebsite.com/image-url-2', 'https://yourwebsite.com/image-url-3', ];

var randomImage = Math.floor(Math.random() * 3)

window.laytheme.on("newpageshown", function(layoutObj, type, obj){
if(type == "page" && obj.id == 34){
jQuery(".mediawrap").css("background-image", "url('" + images[randomImage] +"')");
} else {
jQuery(".mediawrap").css("background-image", "")
}
});
</script>

@Richard-Keith this is for a new site — but v excited to launch in–common projects, take a look: https://www.incommonprojects.co.uk/

@Richard-Keith thanks — great to be able to get it out there 👍

https://www.alicebowsher.co.uk/

We launched this yesterday 🎺 for Alice 🎉

@mariusjopen thanks – really cannot see why it is at present

@mariusjopen Hi Marius. We are using: "All-in-One WP Migration" and "Cookie Notice" plugins, and here is a Pastebin of the custom code https://pastebin.com/SgNDBYaN — and can confirm that all plugins and WordPress and LAY theme all up to date...

@arthur also when I view the image in a tab on its direct path through an IE emulator/viewer (...in Chrome) the image is crisp — https://nickholmesfineart.com/wp-content/uploads/2018/09/NH_portrait_3_alt.jpg

@mariusjopen Hi Marius – thanks. Most images are uploaded larger than required dims, to look nice and crisp on retina screen, so not sure what the best solution is to solve this? I have added the following code to try and help, but it has not done so apparently...

img {
-ms-interpolation-mode: bicubic;
}

Experiencing fuzzy images in Internet Explorer, on most versions it seems. The site is nickholmesfineart.com — is there any way to resolve this ?