五光十色
Meaning
Dazzlingly colourful and varied — used for lights, displays, or anything with many bright hues.
In a sentence
The night market was 五光十色, with lanterns on every stall.
Usage note
Positive. It praises variety and brightness, not chaos.
Where you see it in Brain Challenge
This idiom appears in the picture-idiom levels as a picture or number clue. When the clue shows numbers, the digits usually become the first characters of each half of the idiom — that is why so many chengyu start with 一, 三, 五, 七, 九 or 十.