I found this on reddit and thought I'd share with the rest of you, in case you missed it.
First you need to download and install Rainmeter 4.0.
The final version does not support this, so you need to get the beta client.

https://www.rainmeter.net/
Rainmeter will install itself easily and there is no tricky setup.

Then you need to download the art from deviant art.
I will include a link here to the actual post to give some credit to the author at least.
http://akmos37.deviantart.com/art/All-21-Heroes-interactive-wallpaper-2-1-618415834

On the right you may found a "Download" link. No registration or login needed.
Once its downloaded, simply chose "Open/Install with rainmeter" and it will set it self up.

Easy!

Enjoy your new awesome Overwatch desktop!

Can you still access your desktop?
I have so many icons.

This removes the entire desktop from being visible.
Pressing the windows button still shows your toolbar and you can easily access your desktop from there but in a separate window.

Very cool!