Can you change colors every secend for text?

Sure, one way of doing this would be by running a coroutine which updates the color every second. I wrote an example class which does this and sets the color of a UnityUI Text object to a random color. I wrote this outside of Unity so its possible it has some small errors, but it should give you the general idea of how to accomplish this. You could make the _targetText an array so it affects multiple text objects, or add this script to each text object you have.

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;

 public class ColorChanger : MonoBehaviour
 {
     [SerializeField]
     private Text _targetText = null;

     [SerializeField]
     private float _changeInterval = 1;

     [SerializeField]
     private Color[] _possibleColors = null;

     private void OnEnable()
     {
         // Kick off the change color routine, which is automatically stopped by OnDisable
         StartCoroutine(ChangeColorAsync());
     }

     private IEnumerator ChangeColorAsync()
     {
         // Create a wait object based on our interval, outside of loop to avoid extra allocations
         var wait = new WaitForSecondsRealtime(_changeInterval);
         while (enabled)
         {
             // Change text color to one of our possible colors
             _targetText.color = _possibleColors[Random.Range(0, _possibleColors.Length)];

             // Wait
             yield return wait;
         }
     }
 }