Trouble assigning colors to objects

Hello xD

What i am trying to create is a board in which you can assign colors to different objects. The goal is to have a way to change these colors first through a list and then assign these colors to multiple objects. What i've got trouble with is the assign / render part of the objects. I am new at unity, and it is a very abstract mission i've set for myself.

Code (CSharp):

1. public class ScriptAPI : MonoBehaviour {
2.     public GameObject[] color1;
3.     public GameObject[] color2;
4.     public GameObject[] color3;
5.     public GameObject[] color4;
6.     public GameObject[] color5;
7.  
8.     void Start () {
9.         color1 = GameObject.FindGameObjectsWithTag ("Model1");
10.         color2 = GameObject.FindGameObjectsWithTag ("Model2");
11.         color3 = GameObject.FindGameObjectsWithTag ("Model3");
12.         color4 = GameObject.FindGameObjectsWithTag ("Model4");
13.         color5 = GameObject.FindGameObjectsWithTag ("Model5");
14.  
15.         foreach (GameObject Model1 in color1) {  
16.             // don't know what to write to change the material color.
17.         }
18.         foreach (GameObject Model2 in color2) {        }
19.         foreach (GameObject Model3 in color3) {        }
20.         foreach (GameObject Model4 in color4) {        }
21.         foreach (GameObject Model5 in color5) {        }
22.     }
23.  
24.     void Update () {
25.    
26.     }
27. }
28.  

The code i've made is very amateurish and i am really a beginner at coding, feel free to write completely new code to solve the problem
Any help is appreciated

 

Code (CSharp):

1.  
2. foreach (GameObject Model1 in color1) {
3.     Model1.GetComponent<Renderer>().material.color = Color.red; // etc
4. }
5.  

 

You can also manually punch in RGB values.

 

The problem is was having, is that the color should be dependent on values gotten from a arduino, and the colors just wouldn't work.