The ornamental design for an ornamentcap, as shown and described.
FIG. 1 is a front elevation view of an ornamental cap showing our new design, in a used condition with an ornament shown in broken lines, the rear elevation view being identical.
FIG. 2 is a top, side perspective view thereof.
FIG. 3 is a bottom, side perspective view thereof.
FIG. 4 is a top plan view thereof.
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a left side elevation view thereof, the right side elevation view being identical.
The broken lines shown in the drawings represent portions of the ornament cap that form no part of the claimed design.