Examples of freezing

James Walker is frozen while eating cereal in his home.
(Don't Look Back)

In an unaired scene, a cop guarding Molly at FBI Headquarters is found frozen, his right arm so brittle it has shattered into pieces.
(One Giant Leap)

Sylar freezes part of I-95, causing pursuing police cars to crash.
(Road Kill)

Future Sylar and Future Peter face off. In a creative mirroring of old western movies, Sylar's hands turn to ice at his will, where Peter's ignite flame.
(Five Years Gone)

To simulate a snow globe for his mother, Sylar freezes water from a sink spray-nozzle to form snow.(The Hard Part)

After grabbing Hiro's sword, Sylar freezes it...

...breaking it in half.
(The Hard Part)

Tracy freezes a DC reporter...

...who cracks...

...and shatters when he falls.
(The Butterfly Effect)

Tracy freezes a rose...

...until its petals drop and crack.
(One of Us, One of Them)

Tracy partiallly freezes Dr. Zimmerman.

A distressed Tracy freezes her phone...

...causing it to break.

Tracy shows Nathan her ability, but her hands stay warm.
(I Am Become Death)

Tracy shows Mohinder her ability.

Tracy tries to freeze Mohinder.

She freezes her binds and easily breaks them.
(Dying of the Light)

Tracy grabs Knox..

..freezing him..

..and eventully killing him.
(Dual)