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This is a paid asset, but now you can download Geometric Environment Art Free.
Detail this asset from Unity Store: Original Link
Geometric Environment Art v0.2
A huge set of beautiful environment models all made in a distinctive geometric polygonal art style. Designed to make your game stand out from the crowd.
Over 90 prefabs, all set up with collision and ready to be dropped into your scene.
3 separate example scenes showcasing summer, winter and desert environments.
3 Skyboxes
10 Buildings
23 Rocks
5 Clouds
18 Terrain Pieces
32 Trees
Animating Godrays
Dust and Snow particles