Decorative lamp

[0001]FIG. 1 is a front elevation view of a decorative lamp showing the new design;

[0002]FIG. 2 is a back elevation view thereof;

[0003]FIG. 3 is a left-side view thereof;

[0004]FIG. 4 is a right-side view thereof;

[0005]FIG. 5 is a top plan view thereof;

[0006]FIG. 6 is a bottom plan view thereof;

[0007]FIG. 7 is a perspective view thereof;

[0008]FIG. 8 is another perspective view thereof;

[0009]FIG. 9 is an enlarged view of section 9 of FIG. 8; and,

[0010]FIG. 10 is an enlarged view of section 10 of FIG. 1.

[0011]In the drawings, the evenly-spaced broken lines depict portions of the decorative lamp that form no part of the claimed design. In FIGS. 1, 8, 9, and 10, the dash-dot-dash lines represent an enlarged sectional designation that forms no part thereof.