My friend Jody spent 22 years in the Navy; 3 in active service and the remainder in active Reserves. She traveled the world and went to Iraq as Captain of a supply battalion during Desert Storm. It goes without saying that I am very proud of her.
In her travels, she acquired unusual and fascinating items. Part of her active service was spent in at a coastal Naval base in Germany and that bring us to the item above.
So what it is? They are barnacles--HUGE barnacles. And they include many shades of purple.