OOhh cool, looks like Candy Marble!
I'd try sponging for this look. Here would be the steps with CND Shellac:
- Apply CND Shellac in Cake Pop as normal.
- On a plastic backed pad, pallet or piece of foil decant a few drops of Hotski, Cream Puff and for the third colour I want to say Lobster Roll but you could try Tutti Frutti or Hot Pop Pink.
- Cut some pieces of dense cosmetic sponge and sponge on the three colours to the top film of the cured Cake Pop to create the candy marble look.
- Once the colours are sponged on cure for 2 minutes then apply Shellac UV Top Coat as normal.