Automatically animate your tiles in Unity. Zoom in and out at random intervals. Use to add some realism to sprites buy have them subtly zoom in and out.

AnimateObjectTile.cs

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

public class AnimateObjectTile : MonoBehaviour
{

    private float speed;
    public float minSpeed;
    public float maxSpeed;

    private float zoomAmount;
    public float minZoomAmount;
    public float maxZoomAmount;

    private Vector3 newSize;
    private Vector3 originalSize;

    public bool zoomingOut = true;

    void Start()
    {
        GetRandoms();
        newSize = new Vector3(transform.localScale.x * zoomAmount, transform.localScale.y * zoomAmount, transform.localScale.z * zoomAmount);
        originalSize = transform.localScale;    
    }

    void Update()
    {
        if (zoomingOut)
        {
            if (Vector3.Distance(transform.localScale, newSize) > 0)
            {
                transform.localScale = Vector3.MoveTowards(transform.localScale, newSize, Time.deltaTime * speed);
            }
            if (Vector3.Distance(transform.localScale, newSize) == 0)
            {
                zoomingOut = false;
            }
        }
        else
        {
            transform.localScale = Vector3.MoveTowards(transform.localScale, originalSize, Time.deltaTime * speed);
            if (Vector3.Distance(transform.localScale, originalSize) == 0)
            {
                zoomingOut = true;
            }
        }
    }

    public void GetRandoms()
    {
        speed = Random.Range(minSpeed, maxSpeed);
        zoomAmount = Random.Range(minZoomAmount, maxZoomAmount);
    }
}