This dialog lets you specify the background for your message.
Color lets you choose color for your background. Note that if you specify a background picture, the background will be hidden behind the picture, so changing colors will not affect the appearance.
Custom button gives you option to select from a variety of pre-determined colors or create your own.
Picture field lets you put a picture into background. This picture will be tiled to fill the whole page.
Change button opens the Background picture dialog where you can specify or change the picture.
Remove button removes the background picture.
Sound field lets you specify a sound to be played when the recipient views the message.
Change button opens the Sound dialog where you can specify or change the sound file.
Remove button removes the sound.