Change Unity preview background to a nicer color!

PreviewBackgroundColor.cs

using UnityEditor;
using UnityEngine;

namespace EnhancedHierarchy {
    [InitializeOnLoad]
    static class PreviewBackgroundColor {

        private static readonly Color backgroundColor = new Color(1f, 0f, 1f); // Change this color

        static PreviewBackgroundColor() {

            Camera.onPreRender += (Camera cam) => {
                if (cam && cam.name.Contains("Preview")) {
                    cam.backgroundColor = backgroundColor;
                }
            };

            After.Frames(1, () => {
                var texture = CreateTexture(backgroundColor);

                GUIStyle preBackground = "PreBackground";
                GUIStyle preBackgroundSolid = "PreBackgroundSolid";

                preBackground.normal.background = texture;
                preBackgroundSolid.normal.background = texture;
            });
        }

        private static Texture2D CreateTexture(Color c) {
            var texture = new Texture2D(16, 16);

            for (var x = 0; x < texture.width; x++)
                for (var y = 0; y < texture.height; y++)
                    texture.SetPixel(x, y, c);

            texture.Apply();
            texture.hideFlags = HideFlags.HideAndDontSave;
            return texture;
        }
    }
}

Thanks yes it works, and like you said only when interacting.

Perhaps do you know if it's possible to make the objects brighter in the preview? They are so dark like there is no light on them.

The lighting is hardcoded, there's no way of changing that. Maybe with shaders but that's an unknown world for me.

Ok thanks for letting me know, and for making this enhancement !
I will ask unity for a way to customise this part.

And if you ever find out a way to make the preview background work without interaction in 2019.3 please let me know :)

I found a nice video that is somehow related to this
https://www.youtube.com/watch?v=TPGFnk8guL8

And a few more interesting links

https://timaksu.com/post/126337219047/spruce-up-your-custom-unity-inspectors-with-a

https://github.com/Unity-Technologies/UnityCsReference/blob/master/Editor/Mono/Inspector/PreviewRenderUtility.cs