I'n not referring to tinted sequences which originated during the silent era, but movies that used a moment and/or sequence in color, such as:

RAGING BULL - the title is in color, and the some of the "home movie" sequences are in color.

THEM! - another movie that has only the title word in color.

RUMBLE FISH - some of those little fishies are in color.

THE WOMEN - fashion show sequence in color.

PORTRAIT OF JENNIE - the final shot of the movie is the portrait in color.

SCHINDLER'S LIST - the red coat.

What are some others that use this device?

Spellbound - The last "shot"
Andei Rublev - The paintings at the end

High And Low (Kurosawa)

Wizard of Oz

Sin City

Not sure if this meets your criteria or not.

pleasantville

get it, "colored people" oh they're so smart.

The last episode of the anime series Aim for the Top! GunBuster is in black-and-white (to create the feel of a war documentary) up until the final, poignant scene when it suddenly switches to color. Very effective.

She's Gotta Have It

The Picture Of Dorian Gray

The portrait itself is shown in colour.

should we count kill bill vol. 1? i wonder if cool world does this, or who framed rabbity roger.

he he...

The King of Kings - the movie is in black and white, but the resurrection of Christ is presented in color.

(There's also another sequence that was shot in color, but that's on the roadshow version of the film.)

i suppose thirteen *might* count here too. i believe in one way or another color fades from the movie as the girl's life transitions from out of control to completely whacked out.

good movie, imo

A few horror movies have done this as a gimmick:

The Flesh Eaters (1964) -- an early horror/sci-fi/gore cheapie has a blast of color during the final monster battle.

The Tingler (1959) -- William Castle/Vincent Price horror had red blood during the "acid" trips.

This Night I Will Possess Your Corpse (1967) -- the 2nd feature starring Brazilian horror icon Coffin Joe is all in B&W until Joe is dragged down to hell at the end, and the movie switches to color.

Danish filmmaker Lars von Trier has done this in a few of his movies: The Element of Crime (1984), Epidemic (1988), and Europa (1991).

I'm sure there are more.

original phantom of the opera....great train robbery....lots of hand tinted silents

That's the one I was thinking too. Pink smoke!

The Little Colonel
The Ice Follies of 1939

U2: Rattle and Hum

Not exactly what you're looking for, but a couple of 60s productions, If ... and A Man and a Woman shift between B&W and color, in bothe cases (I believe) because the productions ran short on money and the B&W film stock was cheaper.

Dixiana is an early B&W talkie with a two-strip Technicolor sequence.

More than a touch, but Wings of Desire utilizes B&W and color.

The Secret Garden (1949) - color was used for the garden scenes

Mughal-e-Azam (1960) - just recently the entire 3-hour film was colorized and re-released to theaters.
Note in case you the reader ever wind up on some sort of cinema trivia game show: Supposedly this is the first film in history to be colorized with the specific intent of re-releasing it to theaters.

my fav use of color in a movie is in Sleepy Hollow. the entire movie is grey, black, and shades of blue and green--no bright red (the blood is a dark maroon color) or yellow until the very end after everything is solved and they live happily ever after. the change in color schematics parallels the mood that is intended.

Avalon (sci fi version) is shot in washed out sepia (similar to Von Trier Element of Crime) with the final scenes in vivid color - quite startling.

mud...

Stalker

Ivan the Terrible Part II

I think for the most part, I think
The Saddest Music In The World
was in black and white, some sepia, and color.

Neitzl