The Contour property returns the EffectContour object for the contour effect.
Examples:
The following VBA example determines if a contour effect is applied to the selected shape. If so, it changes the type of color blend and the direction of the contour.
Sub Test()
Dim e As Effect
For Each e In ActiveShape.Effects
If e.Type = cdrContour Then
e.Contour.Direction = cdrContourOutside
e.Contour.ColorBlendType = cdrRainbowCWFountainFillBlend
Exit For
End If
Next e
End Sub