Prepare a flat surface with parchment paper to catch any icing drips.
On a cutting board, use a serrated knife to gently cut graham crackers into shapes to make houses and buildings.
Pipe lines of cookie decorator icing along the edges of the graham crackers as the “glue” to hold them together to make houses. Use scrap pieces of graham cracker to brace and support the sides if needed.
When the icing is set and firm, use more icing to glue candies and nuts onto your houses to create tiled or thatch roofs, decorative trim, and holiday-style decor.
Pipe icing around the edges of all of the buildings, including the rooftops and joints, to create snow drifts and icicles.
Garnish the edges with powdered sugar to make light, dusty snow, and use sanding sugar to resemble packed, glistening snow.
Allow your houses to rest for 1 hour to allow the icing to set.
Gently transfer your finished graham cracker gingerbread houses to a cake stand or rimmed baking sheet (if displaying) and sprinkle all around with flaked coconut to create fluffy snow, or serve and enjoy!