I claim the ornamental design for the insignia templates, as shown and described.
FIG. 1 is a perspective view of one of the insignia template aligned upon a corner of a collar of a shirt and of which an insignia is aligned thereon; and wherein both the shirt and the insignia are depicted in broken lines and form no part of the claimed design.
FIG. 2 is a right side view of the claimed design.
FIG. 3 is a bottom side view of the claimed design.
FIG. 4 is a top view of the claimed design.
FIG. 5 is a perspective view of the claimed design; and,
FIG. 6 is a front view of the insignia templates for use with different insignias.