In advance, make cookie patterns. Cut 2 windows, 4 wings (reverse 2) and 4 exhaust pipes. Bake and cool. Sandwich two sets of wings and exhaust pipes with buttercream icing. Pipe tip 6 detail lines on both. Set aside.
Bake and cool cake. Build up nipple section of bottle with icing to form cone shape. Ice bottle area smooth with spatula to fill in gaps. Use toothpick to mark pattern for door and windows. Center door is 1 in. from neck of bottle. Place windows 5/8 in. each from door. Mark center line on cone. Measure 2 in. place mark on bottle neck and draw line with toothpick from 2 in. mark diagonally to center tip to form diagonal lines. Pipe lines on cone of rocket with tip 6. Ice door and windows smooth and outline with tip 6. Add tip 21 zigzags to bottom area of cone. Add candy-coated chocolate details. Add large spice drop to top of rocket. Add cookie wings and exhaust pipes.
*Combine Leaf Green with Lemon Yellow for green shown.