In LabVIEW 8.2, the functionality was introduced in which you could set an image as the background of your VI. Prior to this version of LabVIEW the only way to do this is to load an image to a picture control and stretch this control over the entire background of the front panel. This is illustrated in the following VI.
Steps to Complete
Select image type (JPG, PNG, or BMP)
Select picture file in the "path to picture file" control.
Run VI once to load image.
Create remainder of VI on top of the "new picture" indicator.