private static IEnumerable<Point> RandomPoints(int size)
{
    var rnd = new Random();

    for (int i = 0; i < size; i++)
        yield return new Point { x = rnd.Next(), y = rnd.Next(), z = rnd.Next() };
}

static void Main(string[] args)
{
    var stopwatch = new Stopwatch();
    var points = RandomPoints(10000).ToArray();

    stopwatch.Start();
    int[] ids = Color.Map(points, 150f);
    stopwatch.Stop();

    Console.WriteLine(stopwatch.ElapsedMilliseconds);
    Console.ReadKey();
}