I made a database for my wife with our sons picture as a background for all the forms and this is how you do it:
This is from the MS Access help file:
1. Open a form in Design view. (dah...)
2. In the Picture property box, type the path and file name for a .bmp, .ico, .dib, .wmf, or .emf file. (I use the .bmp file it works best this way)
3. In the PictureType property box, specify whether you want the picture to be embedded or linked. When you embed a picture, it's stored in the database file. If you embed the same picture in another form, it's added to the database file again. When you link a picture, you don't store it in the database file, but you must keep a copy of it on your hard disk. If you want to use your hard disk space efficiently, specify the Linked setting.
4. You can even resize the background picture using the PictureSizeMode property.
I hope all this help.
Regards.
Jerasi.