The Bunny created palettes that all play well with each other in their respective sets, so you can always pick any combination within a palette and know that it will complement each other. There are also combos that look great together from various collections.
Here are some of the Bunny's favorite color pairings:
World Traveler: Water, Tradewind, Olive Oil, Pesto
Skinny Beach: Spring Break, Conch Pink
Skinny Beach: Seabreeze, Mango Sun, Philodendron