I found this image in one of Zorin wallpaper threads here. Does anyone know what theme this is? I would love to make my applications blurry like this 
I already use blur my shell, but it doesn't do this to my applications. Is there some feature in it I missed?
No. That picture is just a mockup made in Gimp.
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But checkout their GitHub Page:
In particular:
- application folders background
- uses dynamic blur only
- you can select the styling of the background of the folder when it is opened
- window selector when taking a screenshot
- uses static blur only
- lockscreen — to customize the already existing blur
- uses static blur only
- Window List extension
- uses dynamic blur only
- applications
- uses dynamic blur only for the moment
- you can select the opacity of the window that is above the blur: a lower opacity means it will be less legible
- but you can select to make the focused window totally opaque, so that you can enjoy your blur while always having a legible window you work on!
- you can activate an option to better blur the windows while in overview, although it won't make the blur really good anyway in overview
- and there are two modes for blurring applications:
- whitelisting (by default), where only windows that are selected are blurred
- blacklisting, where every window is blurred, excepted for the selected ones
Well that's a shame. Thank you!