What are they for?

The gold trinkets were for the Omen Island Festival event, but that part of it is over. Now people are getting different kinds of sea creatures, but no one knows what to do with them. xD;

What were you supposed to do with them?

There was a place open on the Omen islands where people can "toss" their trinkets into the sea and then they will get a wearable item -- like bracelets and necklaces. You can probably get those items now by buying it from users. They are very cheap. :)

Thanks