Background Property
Returns a ShapeRange object that represents the slide background.
expression.Background
expression Required. An expression that returns one of the objects in the Applies To list.
Remarks
If you use the Background property to set the background for an individual slide without changing the slide master, the FollowMasterBackground property for that slide must be set to False.
Example
This example sets the background of the slide master in the active presentation to a preset shade.
ActivePresentation.SlideMaster.Background.Fill.PresetGradient _
Style:=msoGradientHorizontal, Variant:=1, _
PresetGradientType:=msoGradientLateSunset
This example sets the background of slide one in the active presentation to a preset shade.
With ActivePresentation.Slides(1)
.FollowMasterBackground = False
.Background.Fill.PresetGradient Style:=msoGradientHorizontal, _
Variant:=1, PresetGradientType:=msoGradientLateSunset
End With