[C#] Draw custom sinisterly winForms using GDI+

Code:
String title = this.Text;

Color clBackground = Color.FromArgb(20, 20, 20); // background
Color clBackgroundBorder = Color.FromArgb(24, 24, 24); // background border
Color clForeground = Color.FromArgb(28, 28, 28); // foreground

Color clHeaderBackground = Color.FromArgb(17, 17, 17); // header background
Color clHeaderForeground = Color.FromArgb(31, 31, 31); // header foreground
Color clHeaderFont = Color.FromArgb(206, 206, 206); // header font

e.Graphics.FillRectangle(new SolidBrush(clBackground), new Rectangle(new Point(0, 0), new Size(this.Width, this.Height))); // Draw background
e.Graphics.DrawRectangle(new Pen(clBackgroundBorder), new Rectangle(new Point(0, 0), new Size(this.Width - 1, this.Height - 1))); // Draw background border
e.Graphics.FillRectangle(new SolidBrush(clHeaderBackground), new Rectangle(new Point(11, 11), new Size(this.Width - 22, 40))); // Draw header background

Size textSize = TextRenderer.MeasureText(title, new Font("Arial", 9.0f)); // Measure title size in px
int contentWidth = textSize.Width + 12; // Variable that holds the header foreground and TextRenderer width

e.Graphics.FillRectangle(new SolidBrush(clHeaderForeground), new Rectangle(15, 17, contentWidth, 28)); // Draw header foreground rectangle
Point[] trianglePoints = { new Point(contentWidth + 15, 17), new Point(contentWidth + 15, 45), new Point(contentWidth + 25, 31) }; // Calculate triangle points
e.Graphics.FillPolygon(new SolidBrush(clHeaderForeground), trianglePoints); // Draw triangle next to the header foreground rectangle
TextFormatFlags flags = TextFormatFlags.VerticalCenter | TextFormatFlags.EndEllipsis; // TextFormat shenanigans
TextRenderer.DrawText(e.Graphics, title, new Font("Arial", 9.0f), new Rectangle(22, 17, contentWidth, 28), clHeaderFont, flags); // Draw title

e.Graphics.FillRectangle(new SolidBrush(clForeground), new Rectangle(new Point(11, 61), new Size(this.Width - 22, this.Height - 72))); // Draw foreground