Hey,
I would love to share my own Alfred Theme called "macOS Dark Theme". It's lightly inspired in spotlight and also have beautiful purple alfred-like details on selector. I hope you have a great time using it!
You can download it here
An Alfred v3 theme inspired by Material Design.
To download: https://github.com/zhongwei-z/Alfred-Material-Theme/raw/master/Material.alfredappearance
Hope you enjoy!