Formal:
* The king sat upon his throne, surveying his kingdom.
* The queen's throne was adorned with precious jewels.
* After a long and arduous battle, the victorious general ascended the throne.
Figurative:
* He felt like he had ascended to the throne of his own life, finally in control of his destiny.
* The CEO held a throne in the business world, feared and respected by all.
* Her words carried the weight of a throne, commanding attention and respect.
Informal:
* My dog thinks he's the king of the house and has claimed the couch as his throne.
* I'd rather be relaxing on my couch than stuck on a dusty old throne.
The best way to use "throne" depends on the context and desired tone.