Some may like this:

CSS - Random Background Template.xar

Details on the images here: https://picsum.photos/.

I tried to get TG to randomise the following:

Click image for larger version.  Name: 640.jpg  Views: 84  Size: 21.9 KB  ID: 127623

You will just have to embed the code or add the source to your browser address:
HTML Code:
<img src="https://picsum.photos/800/640.jpg" />
Acorn