The BackColor of a form is set to SystemColors.Control.
This is also found in SystemPens.Control and SystemBrushes.Control.
The actual color is dependant upon the windows color scheme or even the users theme.
To put this color on to an image open the image as an Image or Bitmap then draw on the image using a Graphics object for the image. Here is an example of drawing to an image.
private void button4_Click(object sender, EventArgs e)
var test = new Bitmap(100, 100);
var g = Graphics.FromImage(test);
var pen = new Pen(SystemColors.Control, 20);
g.DrawEllipse(pen, 0, 0, test.Width, test.Height);
g.FillEllipse(SystemBrushes.ControlDark, 0, 0, test.Width, test.Height);
this.BackgroundImage = test;
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