Assemble house according to package directions, 1 day in advance.
Make door and windows. Use spatula and icing to ice door and windows smooth. Use tip and white icing in cut disposable decorating bag from kit to outline door, windows and window panes. Pipe icicles under windows. Use dots of icing to attach candy lights above windows and candy rounds on door, door window and sides of house windows.
Outline house. Use tip and white icing in cut disposable decorating bag to pipe zigzags at corners of house and lines under eaves. Use scissors to trim peppermint sticks to fit at corners and attach.
Decorate roof. Use spatula and icing to ice roof smooth. Use tip and white icing in cut disposable decorating bag to pipe scallops on roof. Attach candy round at each scallop point. Pipe icicles around eaves. Position candy rounds on front eave icicles and candy lights on peak of roof.
Decorate base. Use spatula and icing to ice board fluffy. Use tip and icing to attach jelly trees at front of house.
Hold bag at a 45° angle and touch tip to the surface. Squeeze at starting point so that icing sticks to surface. Now raise tip slightly, and as you squeeze, guide tip slightly above surface. To end outline, stop squeezing, touch tip to surface and pull tip away. After outline, fill in using a zigzag motion to fill area. Pat smooth using finger dipped in cornstarch.