Line a baking sheet with plastic wrap or wax paper.
Melt pink candy melts in a microwave-safe bowl according to package directions. Do the same with blue and purple. Pour blue and purple candy melts into squeeze bottles or ziploc/piping bags with a small tip cut off.
Pour melted pink candy onto the baking sheet and spread into a rectangle, about 1/4-inch thick.
Drizzle with blue and purple candy. Tap baking sheet against the counter or table to help the candy flatten out.
Immediately top with sprinkles and decorations. (If you're going to use gold foil, make sure to leave some empty spaces where you'd like to put it. Then once the bark is dry and set, press on the foil.)
Place baking sheet in the fridge for about 30 minutes to and hour for bark to set. Once bark is hard, use a knife to cut it into pieces, or use your hands to break it up.
Store in refrigerator until ready to use.