Aurora inspired coaster with alternative ending

Last weekend we had a wonderful Aurora Australis due to a solar storm. I couldn't see it from here because we had lots of cloud cover and we don't have a clear view to the south, but there were many pictures posted online. They have inspired me to mix these colours, orange, red, bright pink and purple. For this coaster I used my simple hexagon flower pattern but with an alternative ending. For the 4th round, just do 5 dc into the 6 corners, 2 dc into each 2 ch space, and also 1 dc into the top of each cluster stitch. There is no 5th round.

Simple hexagon flower in 4 rounds