Decorate panels. Cut 1/8 in. off tip of bags of all colors. Pipe a stripe of dark blue/green in center of top half of front panel. Let sit for 30 seconds. Pipe light teal on either side, let sit for 30 seconds. Pipe red on either side, let sit for 30 seconds. Pipe dark blue/green, let sit. Pipe pink, let sit. Pipe dark blue/green, let sit. Pipe red, let sit.
Outline door and windows with teal pipe a red doorknob.
Use pink icing to pipe horizontal stipe at bottom edge of vertical stripes.
Use tinted icings to pipe stripes alternating with white over roof panels; complete one panel at a time. Immediately use a toothpick to drag the colors together, keep all the dragging the same direction.