Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download UI Pack: Toony PRO Free.
UI Pack Toony PRO v1.1.5
This package contains 300+ textures, 80 prefabs of cartoon style UIs, 26 sample scripts and 20 live demo scenes, etc.
UI Animations in this package are powered by GUI Animator for Unity UI. It is included and regularly updated with this package.
Web Demo | LITE version
• 80+ UI prefabs.
• 300+ psd files.
• 20 demo scenes for Landscape and Portrait orientations.
• 26 sample C# scripts.
• 15 Particle that compatible with Unity UI Canvas.
• 39 sounds.
• Supports all build player platforms.
• GUI Animator for Unity UI is included.
• Unity 5.5.1 or higher.
• Learn how to create sprite atlas for Unity UI, see tutorial on Youtube or Unity Doc.