Editor Script that generates a single color texture

GenerateColorTexture.cs

using System.IO;
using UnityEngine;
using UnityEditor;

public class GenerateColorTexture : EditorWindow
{
    private Color textureColor;
    private string textureName;
    private Vector2Int dimensions;
    
    [MenuItem("Tools/Generate Color Texture")]
    static void Init()
    {
        // Get existing open window or if none, make a new one:
        GenerateColorTexture window = (GenerateColorTexture)EditorWindow.GetWindow(typeof(GenerateColorTexture));
        window.Show();
    }

    void OnGUI()
    {
        textureColor = EditorGUILayout.ColorField("Color", textureColor);
        textureName = EditorGUILayout.TextField("Filename", textureName);
        dimensions = EditorGUILayout.Vector2IntField("Dimensions", dimensions);
        if (GUILayout.Button("Generate Texure"))
        {
            var texture = new Texture2D(dimensions.x, dimensions.y);
            var dim = dimensions.x * dimensions.y;
            var colors = new Color32[dim];
            for (int i = 0; i < dim; i++)
            {
                colors[i] = textureColor;
            }
            texture.SetPixels32(colors);
            texture.Apply();
            byte[] bytes = texture.EncodeToPNG();
            var dirPath = Application.dataPath + "/";
            var filename = dirPath + textureName + ".png";
            File.WriteAllBytes(filename, bytes);
            AssetDatabase.ImportAsset("Assets/" + textureName + ".png");
        }
    }
}