Can someone tell me how to put a background image in a Form in VB.NET?

I used a PictureBox, but is it possible to put an image in a Form without it ?

I tried using the "Background Image" property of the Form, but the problem is that the form has another property called "Backcolor" that puts an "opaque" color (it doesn´t let me put the value "transparent" in a Form) and so it hides the image.