If desired, cut rice paper sheet into an almond shape, or whatever shape you want.
Add warm water into a large plate and add a few drops of food coloring. Disperse the food coloring for even solid colored sails, or you can leave the drops of color, or gently spread the color without fully dissolving for ombre effects.
Working with one rice paper sheet at a time, soak it in the water for a minute or so, or until they're soft.
Carefully transfer the softened rice paper sheet onto a silicone mat, or parchment paper. Mold it into whatever shape you want. You may want to use paper clips, or clamps to give the mat some shape and dimension. Or you can place something underneath to give dimension.
Now, let them dry on the counter for 8-10 hours, or overnight. Once dry, they're super easy to detach from the mat.
To secure onto a cake, use frosting as a glue.