Make cookies. Prepare dough following recipe directions. Press dough into test tube and beaker cavities, filling 2/3 full. Place mold on cookie sheet for support. Bake and cool cookies. Unmold according to mold package directions.
Decorate cookies. Tint small amount of decorator icing black; reserve majority white.
For beaker, use tip 2, a cut disposable decorating bag and white icing to outline and fill in rectangle, 1 in. x 3/4 in. Pat smooth with finger dipped in cornstarch. Use green Sparkle Gel to fill in around rectangle. Use spatula to smooth. Add green nonpareils. Use tip 2, a cut disposable decorating bag and black icing to pipe skull and cross bones in white rectangle.
For test tube, use green Sparkle Gel to outline and fill in cookie. Use spatula to smooth. Add green nonpareils.