The MakeColorPalette method shown below builds an array of PictureBoxes with BackColor properties set to a standard color palette.

// Make a color palette on the given parent.
private void MakeColorPalette(Control parent,
    int x, int y, System.EventHandler event_handler)
{
    Color[] colors = 
    {
        Color.White,
        Color.FromArgb(255, 255, 192, 192),
        Color.FromArgb(255, 255, 224, 192),
        Color.FromArgb(255, 255, 255, 192),
        Color.FromArgb(255, 192, 255, 192),
        Color.FromArgb(255, 192, 255, 255),
        Color.FromArgb(255, 192, 192, 255),
        Color.FromArgb(255, 255, 192, 255),
        Color.FromArgb(255, 224, 224, 224),
        Color.FromArgb(255, 255, 128, 128),
        Color.FromArgb(255, 255, 192, 128),
        Color.FromArgb(255, 255, 255, 128),
        Color.FromArgb(255, 128, 255, 128),
        Color.FromArgb(255, 128, 255, 255),
        Color.FromArgb(255, 128, 128, 255),
        Color.FromArgb(255, 255, 128, 255),
        Color.Silver,
        Color.Red,
        Color.FromArgb(255, 255, 128, 0),
        Color.Yellow,
        Color.Lime,
        Color.Cyan,
        Color.Blue,
        Color.Fuchsia,
        Color.Gray,
        Color.FromArgb(255, 192, 0, 0),
        Color.FromArgb(255, 192, 64, 0),
        Color.FromArgb(255, 192, 192, 0),
        Color.FromArgb(255, 0, 192, 0),
        Color.FromArgb(255, 0, 192, 192),
        Color.FromArgb(255, 0, 0, 192),
        Color.FromArgb(255, 192, 0, 192),
        Color.FromArgb(255, 64, 64, 64),
        Color.Maroon,
        Color.FromArgb(255, 128, 64, 0),
        Color.Olive,
        Color.Green,
        Color.Teal,
        Color.Navy,
        Color.Purple,
        Color.Black,
        Color.FromArgb(255, 64, 0, 0),
        Color.FromArgb(255, 128, 64, 64),
        Color.FromArgb(255, 64, 64, 0),
        Color.FromArgb(255, 0, 64, 0),
        Color.FromArgb(255, 0, 64, 64),
        Color.FromArgb(255, 0, 0, 64),
        Color.FromArgb(255, 64, 0, 64),
    };
    const int num_rows = 6;
    const int num_columns = 8;
    const int pic_width = 20;
    const int pic_height = 20;
    const int spacing = 4;

    int row_y = y;
    for (int row = 0; row < num_rows; row++)
    {
        int column_x = x;
        for (int column = 0; column < num_columns; column++)
        {
            PictureBox pic = new PictureBox();
            pic.Parent = parent;
            pic.Click += event_handler;
            pic.BackColor = colors[row * num_columns + column];
            pic.Size = new Size(pic_width, pic_height);
            pic.Location = new Point(column_x, row_y);
            pic.BorderStyle = BorderStyle.Fixed3D;
            column_x += pic_width + spacing;
        }
        row_y += pic_height + spacing;
    }
}

The code starts by defining an array containing the colors that should be in the palette. It then loops through the array building PictureBoxes. The code sets each PictureBox's:

• Parent to the control that should contain the PictureBox. Note that a form is a type of control so the program can pass that for the method's parent parameter.
• Click event handler. This is the delegate passed in by the calling code.
• BackColor
• Size
• Location
• BorderStyle

The code then updates the position of the next PictureBox and continues the loop.