Re: odd coloured sand ornaments
The one we bought when we visited Alum Bay in the 1960s wasn't packed as tightly as it should have been, leaving a small pocket of air at the top, which allowed the sand to start mixing if it was moved at all. After a while the entire top was no longer banded colours but a uniform yellowy-grey.
At least back then they still allowed you to collect your own coloured sand from the cliffs - that was before they realised that "human" erosion was going to eat the cliffs a damn sight faster than natural erosion!