Salicylic acid, a key ingredient in anti-acne products looks quite interesting under the microscope, displaying a small amount of birefringence.
Have a look at the sporophyll of Bracken under the microscope.
Have a look at Cardiac muscle under the microscope :).
Sodium thiosulfate is a inorganic, white crystalline substance that displays incredible birefringence, why not have a peek?
Have a look at a section of an earth worm under the microscope.
Enjoy the marvel that is St Paul's Cathedral, in Melbourne, Australia. The Architecture and ornate detail is something that never fails to amaze.