1985:

Rainbow Ponies

The second set of Rainbow Ponies were more daring in their colours. They still had two each of Unicorn, Pegasus and Earth Pony, and still each pony had a four coloured mane and tail. But the colours were more vibrant than the last set - melon, pink, blue and neon yellow.

These ponies were not sold in the UK despite being included in UK stories and the Fact File. The exception to that rule was Confetti, who had a very special role as Ponyland's first bride :)