As a noun:
* The stark contrast between the bustling city and the peaceful countryside was striking.
* The designer used a bold contrast of black and white in the room's décor.
* There was a sharp contrast in their opinions on the matter.
As a verb:
* The bright colors of the flowers contrasted beautifully with the lush green foliage.
* Her elegant dress contrasted sharply with the casual attire of the other guests.
* The author contrasted the protagonist's optimism with the antagonist's cynicism.
In phrases:
* In contrast to her usual cheerfulness, she was unusually quiet today.
* The study revealed a significant contrast between the two groups.
* There's a clear contrast between what he says and what he does.
Remember: The best way to use "contrast" in a sentence depends on the context and what you want to express. Choose the form (noun or verb) and phrase structure that best conveys your meaning.