The ornamental design for a memorabilialamp, as shown and described.
FIG. 1 is a top, front, and left side perspective view of a memorabilia lamp showing my new design;
FIG. 2 is a rear elevational view thereof, with the broken-line disclosure of football memorabilia being shown for illustrative purposes only and forming no part of the claimed design;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a side elevational view thereof; and,
FIG. 6 is an opposite side elevational view thereof.