有特殊意義的夢通常是彩色的，而不是黑白的。(翻成英文)

Dreams that have personal significance usually appear with colors, not black-and-white.

2013-02-05 22:10:30 補充：
Sorry, 漏打ㄧ個字→ in

Dreams that have personal significance usually appear with colors, not in black-and-white.

Has a special meaning in dreams are usually color rather than black and white.

of colors(X)
in colors(O)

2013-02-05 13:08:48 補充：
But mean differently. "Of color" is not to be used in your case.

有特殊意義的夢通常是彩色的，而不是黑白的。

A dream with a special meaning is usually of colors, and not black-
and-white.

A significant dream is mostly colorful and not black-and-white.




2013-02-05 11:32:35 補充：
Both are correct.

2013-02-05 14:03:15 補充：
"of" colors表性質、類別; "in" colors表方式、外觀.
Both are correct, yet "of colors" fits the meaning better.

2013-02-05 14:17:15 補充：
You "make" a dream in colors, and so the dream "is" of colors.