My Little Pony - Tropical Pony Sea Breeze (1989)

One sunny day, four pony friends sailed under the rainbow's arch and discovered a tropical island where everything shone with the brightest and most beautiful colors the ponies ever saw. Pina Colada and Sea Breeze hopped onto the dazzling pink beach to play volleyball, while Tootie Tails and Hula Hula splashed in the sparkling blue water. While the four friends nibbled a tasty lunch beneath gleaming green palm trees, tropical rainbow dew fell on them and changed them into the brightest ponies of all. The delighted friends quickly sailed back to Ponyland to show everyone their brilliant new look. And that is the story of how the Tropical Ponies got their bright colors!