The ornamental design for a palette, as shown and described.
FIG. 1 is a top perspective view of a palette showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a right side view thereof, the left side view being a mirror image of the right side view;
FIG. 6 is a bottom view thereof;
FIG. 7 is a cross-sectional view thereof taken along the line 7-7 in FIG. 4; and,
FIG. 8 is a top perspective view thereof with one lid opened and another lid opened and exploded.
Left side view not shown is a mirror image of the right side view. Hatch lines in FIG. 7 depict internal structure not visible from the exterior that do not form part of the design sought to be patented.