Override of RenderStaticPreview for tinting an asset preview icon to a scriptable object's color

ScriptableObjectWithColorEditor.cs

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(ScriptableObjectWithColor))]
public class ScriptableObjectWithColorEditor : Editor
{
    public override Texture2D RenderStaticPreview(string assetPath, Object[] subAssets, int width, int height)
    {
        ScriptableObjectWithColor targetObj = (ScriptableObjectWithColor)target;
        if (targetObj == null)
        {
            return null;
        }
        var s = Shader.Find("UI/Default");
        if(s == null)
        {
            return null;
        }
        var m = new Material(s);
        m.color = targetObj.color;
        var renderTex = new RenderTexture(width, height, 0);
        var prevRT = RenderTexture.active;
        Graphics.Blit(AssetPreview.GetMiniThumbnail(target), renderTex, m);
        var outputTex = new Texture2D(width, height);
        outputTex.ReadPixels(new Rect(0, 0, renderTex.width, renderTex.height), 0, 0);
        outputTex.Apply();
        RenderTexture.active = prevRT;
        renderTex.Release();
        return outputTex;
    }
}