The ornamental design for a decorativelamp, as shown and described.
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1. Decorative lamp
1.1 : Back
1.2 : Front
1.3 : Perspective
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
Decorative lamp with a three-dimensional star as a lampshade; the three-dimensional star is a so-called Herrnhuter star.