I'm really likeing these. The way you've turned them and allowed them to find their own shape as they dry. I'm guessing they are from slices of a euclipt trunk.
As said above, not like any Euclipt I've ever seen in the UK before, Steve describes euclipt as Pink, I think of it as grey, and always stringy, that tears it'self apart while drying. However in Auz, there are meny more species of euclipt than we grow over here (and then mostly as ornimentals) so it's not likely to be one we are very famillier with.