The ornamental design for decorative butterflies and the placement of the decorative butterflies on a pair of shoes, as shown and described.
FIG. 1 is an perspective view of the decorative butterflies, illustrating the overall visual appearance of the decorative butterflies and the placement of the decorative butterflies in the upper and lower portions of each shoe which embodies my design;
FIG. 2 is a front view the decorative butterflies, illustrating the overall visual appearance of the decorative butterflies and the placement of the decorative butterflies in the upper and lower portions of each shoe which embodies my design;
FIG. 3 is a rear view of the decorative butterflies, illustrating the overall visual appearance of the decorative butterflies and the placement of the decorative butterflies in the upper portions of each shoe which embodies my design; and,
FIG. 4 is a top view of a single decorative butterfly, shown separately for clarity of illustration.
The shoes shown in broken lines in FIGS. 1-3 are for illustrative purposes only and form no part of the claimed design.