These DIY sugar cube skulls are SO easy to make, it's hard to even call this a recipe! But with the upcoming holidays, these make fantastic gifts while packaged up in a mug with some coffee or tea. These DIY sugar cubes come together easily with just regular granulated sugar, water, gel food coloring, and (optional) flavoring extract. Simply mix in the gel food coloring with sugar, and use a spray bottle to add in your water and flavoring (if using). Press into molds, let dry, and finish by baking, and you have an easy and inexpensive gift!