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static void Main(string[] args)
{
  var colors = new ConsoleColor[] { ConsoleColor.Black, ConsoleColor.Blue, ConsoleColor.Cyan,
    ConsoleColor.DarkBlue, ConsoleColor.DarkCyan, ConsoleColor.DarkGray, ConsoleColor.DarkGreen,
    ConsoleColor.DarkMagenta, ConsoleColor.DarkRed, ConsoleColor.DarkYellow, ConsoleColor.Gray,
    ConsoleColor.Green, ConsoleColor.Magenta, ConsoleColor.Red, ConsoleColor.White, ConsoleColor.Yellow };
  var query = from c1 in colors from c2 in colors where c1 != c2 select new { c1, c2 };
  foreach (var pair in query)
  {
    Console.BackgroundColor = pair.c1;
    Console.ForegroundColor = pair.c2;
    string s = $"Sample of {pair.c2} on {pair.c1}";
    int pad = (45 - s.Length) / 2;
    s = new string(' ', pad) + s;
    Console.WriteLine(s.PadRight(45));
  }
  Console.ResetColor();
}