This is a paid asset, but now you can download Background Effects for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Background Effects v1.0
(Tested with Unity version 2020.3.23f1)
Here you can find various ambient background effects for different purposes. These backgrounds are suitable for main menu and live games.
Backgrounds work with any render pipeline as they use standard particle shaders.
Works with Unity 2020.3.18f1 and above.
Asset includes 20 prefabs.
Texture sizes: 2048×2048, 512×512, 256×256, 64×64.
List of effects:
Blurred flow blue
Blurred flow green
Blurred flow red
Dark hole
Funnel blue
Funnel yellow
Hacker type
Points path orange
Points path turquoise
Side fire
Side fumes
Side highlights pink
Side highlights violet
Ski-Fi blue
Ski-Fi violet
Sparkles
Star trip
Underwater
Up trails flow blue
Up trails flow yellow
Blood
Snow
Coffee
Net green
Net orange
Love
Clouds