The burnished brown seed cases are, to my taste, the most elegant buttons, both in their closed state and when they have opened, having dropped their numerous seeds.
Leptospermum blossoms, nectar, wood (and presumably seeds) feed many creatures, many of whom make the air hum.
Also called tea tree, these fragrant bushes smell like scorched candy canes.
A wonderful place for learning and seeing is Colin Cornford's Leptospermum, part of the encyclopedic site of the Society for Growing Australian Plants.
Also highly recommended, and part of the same site is R.H. Donaghey's Associations Among Plants, Birds and Insects.