Rose pink and silver drip cake for a birthday

What is the drip on cakes made of?
To make these colorful ganache drips, all you have to do heat your heavy cream until it's steaming, then pour it over the white chocolate. After letting it sit for a couple minutes, the white chocolate softens. Then you just add in a squirt of gel food coloring and give it a good stir until it's smooth
Making a birthday drip cake is so much fun!