今天可以给我的程序换皮肤颜色了，牛，高兴。

Calendar1.DayStyle.BackColor = System.Drawing.Color.Green;

根据这个属性可以给窗体设置皮肤切换

private void 蓝色理想ToolStripMenuItem_Click(object sender, EventArgs e)
{
menuStrip1.BackColor = System.Drawing.Color.DeepSkyBlue;
toolStrip1.BackColor = System.Drawing.Color.MediumBlue;
Form1.ActiveForm.BackColor = System.Drawing.Color.MidnightBlue;

}

private void 红色浪漫ToolStripMenuItem_Click(object sender, EventArgs e)
{
menuStrip1.BackColor = System.Drawing.Color.SandyBrown;
toolStrip1.BackColor = System.Drawing.Color.NavajoWhite;
Form1.ActiveForm.BackColor = System.Drawing.Color.PapayaWhip;

}

private void 绿色呼吸ToolStripMenuItem_Click(object sender, EventArgs e)
{
menuStrip1.BackColor = System.Drawing.Color.Green;
toolStrip1.BackColor = System.Drawing.Color.YellowGreen;
Form1.ActiveForm.BackColor = System.Drawing.Color.LightGreen;
}