Hair and Skin Color Buttons

I am trying to create colored squares for players to pick hair and skin color from using GUI.Layout. So far my code looks like this.

 GUILayout.BeginHorizontal();
             GUILayout.Label ("Hair Color");
 
             foreach(Color hairColor in HairColorPalette){
                 Color[] buttonColor = new Color[2500];
                 int x = 0;
                 if(x < 2500){
                 buttonColor[x]= hairColor;
                     x += 1;
                 }
                 Texture2D buttonTex = new Texture2D(50, 50);
                 buttonTex.SetPixels(buttonColor);
                 if(GUILayout.Button(buttonTex)){
                     return;
 
 
                 }

The buttons show up but they remain colorless. I'm not sure what I am doing wrong. Any ideas?