The ornamental design for a decorativeextrusion, as shown and described.
FIG. 1 is a front elevational view of the decorative extrusion showing my
new design, wherein the back elevational view thereof is substantially
identical thereto;
FIG. 2 is a right side elevational view thereof, wherein the left side
elevational view thereof is substantially identical to the right side
elevational view illustrated; and
FIG. 3 is a top plan view thereof; the bottom plan view being substantially
identical thereto.