dark
There were dark streaks down her cheeks where she had been crying.

faint, pale
bright
blond, golden, grey/gray

streak of
The last streaks of light faded from the sky.

a streak of lightning
A streak of lightning forked across the sky.

a streak of red, white, etc.
She had a few streaks of white in her black hair.

strong
hidden
cruel, mean, nasty, ruthless, selfish, vicious, violent
independent, rebellious, stubborn
adventurous, competitive
puritanical

have
Most of the players have a strong competitive streak.

reveal, show
She suddenly revealed a mean streak in her character.

with a streak
trips for those with an adventurous streak

streak of
There was a streak of eccentricity in the family.

hot (esp. AmE), lucky
unbeaten (esp. AmE), undefeated (esp. AmE), winning
The Yankees continued their six-game winning streak.

losing, winless
Selby finally ended their five-game winless streak.

scoreless (AmE)

be on, go on (esp. AmE)
The team has been on a winning streak since it won against Lazio.

continue, extend
break (esp. AmE), end, snap (AmE)