Simple and Direct:
* The child sulked in the corner after being told no.
* She sulked for hours after the argument.
Descriptive:
* He sat alone in the garden, sulking over the lost game.
* Her face wore a sullen expression as she sulked in silence.
Figurative:
* The city sulked under a blanket of grey clouds.
* The economy sulked, showing little sign of recovery.
Humorous:
* I'm not sulking, I'm just deeply contemplating the injustice of it all.
The best sentence for "sulk" will depend on the specific context and the desired tone.