Sift rice flour, glutinous rice flour, and cornstarch into a mixing bowl. Add sugar and mix well. If making only one color, triple the recipe. Otherwise, proceed to the next step.
Repeat step 1 for the other two colors, adding butterfly pea flower powder and purple yam powder respectively.
Add whipping cream, milk, and vegetable oil to each bowl. Mix well until no clumps remain.
Drain the mixture through a fine sieve into a bowl.
Cover the bowl with plastic wrap and poke a few holes in it. Steam for 15-20 minutes over medium-high heat, or until no liquid remains.
After cooking, use a fork to mash the mixture and set aside to cool. For quicker cooling, place it in the freezer for 5 minutes or until lukewarm.
Once cooled, knead the snow skin dough until smooth, about 5-10 minutes. Repeat this process for the other colors.
Wrap the three colored snow skins (white, purple, blue) with plastic wrap and place in the fridge for at least 1 hour.
To Prepare Cooked Glutinous Rice Flour
Place the glutinous rice flour in a microwavable bowl and heat for 15 seconds or until warm.
If using a frying pan, stir-fry the flour over low heat until cooked. The color will turn light yellow.