Highlight Property Drawer - Simply sets the text/background colour of a field in the inspector.

HighlightAttribute.cs

// Do NOT put me in an /Editor/ folder
// Questions/bugs: chris@vitei.com

using UnityEngine;

public class HighlightAttribute : PropertyAttribute { 
    public Color col;

    public HighlightAttribute(float r=1, float g=0, float b=0) {
        this.col = new Color(r,g,b,1);
    }
}

HighlightDemo.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class HighlightDemo : MonoBehaviour {

    [Highlight(1, .5f, .5f)]
    public int Int = 1;
    [Highlight(1, 1, .2f)]
    public float Float = 1.23f;
    [Highlight(1, .5f, 0)]
    public float[] Array = new float[] { 1, 2, 3, 4, 5 };


}

HighlightPropertyDrawer.cs

// Put me in an /Editor/ folder
// Questions/bugs: chris@vitei.com

using UnityEngine;
using UnityEditor;
using System.Collections;

[CustomPropertyDrawer(typeof(HighlightAttribute))]
public class HighlightPropertyDrawer : PropertyDrawer {
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {
        var col = (attribute as HighlightAttribute).col;
        Color prev = GUI.color;
        GUI.color = col;
        EditorGUI.PropertyField(position, property, label, true);
        GUI.color = prev;

    }
}