I think from reading between the lines that you have:
1) Constructed a panel
2) Dynamically created an array of PictureBox controls, each to display an image.
3) Tried to set the Image property, and been told it doesn't exist, so are trying to use the BackgroundImage property instead.
This implies that what you tried was
Panel1.Image = new Image(@"c:\...
but the compiler complained.
A Panel control does not have an Image property (irt does have a BackgroundImage, but this is not what you want). What you need to do is set the Image property of each PictureBox control instead.
Have you added the PictureBox controls to the Panel.Controls list?
Have you given them all new Location properties, and appropriate sizes?
If you have many images, you may be better off drawing them yourself with the Paint event.