Generate a bitmap composed of random squares in different shades of blue

TwitterRandomSquareBackground.cs

void Main()
{
	var bmp = new Bitmap(1920, 1200);
	
	const int size = 20;
	
	Random r = new Random();
	
	Color colorA = Color.FromArgb(0, 148, 255);
	Color colorB = Color.FromArgb(145, 216, 255);
	
	using(var g = Graphics.FromImage(bmp))
	{
		int y = 0;
		while(y < bmp.Height)
		{
			int x = 0;
			while(x < bmp.Width)
			{
				var color = ColorInterpolator.InterpolateBetween(colorA, colorB, r.NextDouble());
				g.FillRectangle(new SolidBrush(color), x, y, x + size, y + size);
				x += size;
			}
			
			y += size;
		}
	}
	
	bmp.Save(@"F:\Temp\twitter.png");
	
	using(var form = new Form())
	{
		var p = new PictureBox();
		p.Image = bmp;
		p.Dock = DockStyle.Fill;
		form.Controls.Add(p);
		Application.Run(form);
	}
}

// https://stackoverflow.com/questions/1236683/color-interpolation-between-3-colors-in-net
class ColorInterpolator {
    delegate byte ComponentSelector(Color color);
    static ComponentSelector _redSelector = color => color.R;
    static ComponentSelector _greenSelector = color => color.G;
    static ComponentSelector _blueSelector = color => color.B;

    public static Color InterpolateBetween(
        Color endPoint1,
        Color endPoint2,
        double lambda) {
        if (lambda < 0 || lambda > 1) {
            throw new ArgumentOutOfRangeException("lambda");
        }
        Color color = Color.FromArgb(
            InterpolateComponent(endPoint1, endPoint2, lambda, _redSelector),
            InterpolateComponent(endPoint1, endPoint2, lambda, _greenSelector),
            InterpolateComponent(endPoint1, endPoint2, lambda, _blueSelector)
        );

        return color;
    }

    static byte InterpolateComponent(
        Color endPoint1,
        Color endPoint2,
        double lambda,
        ComponentSelector selector) {
        return (byte)(selector(endPoint1)
            + (selector(endPoint2) - selector(endPoint1)) * lambda);
    }
}