bold, bright, brilliant, glowing, iridescent, vibrant, vivid
dark, deep
Dark colours suit you best.

intense, lush (esp. AmE), rich, saturated, strong
the intense colour of new leaves

faded, light, muted, pale, pastel, soft, subdued, subtle
dull
garish, gaudy, loud, lurid
autumn (esp. BrE), autumnal, earthy, fall (AmE), warm
cool
cool colours like blue and gray

sombre/somber
attractive, beautiful, lovely
good
Green is a good colour on you.

complementary, contrasting
matching
basic
primary, secondary
indeterminate, neutral
natural
blue, red, etc.
The curtains went a strange orange colour when we washed them.

bluish, reddish, etc.
pure, solid, uniform
Simple patterns and solid colours are particularly effective.

full
a 48-page reference section in full colour
a 24-page full-colour booklet

eye, hair, skin
What is her natural hair colour?

dash, flash, splash
mass, riot
The garden is a riot of colour in spring.

spot, touch

change
The chameleon changes colour to match its surroundings.

add
The silk cushions add colour to an otherwise dull room.

match
Your shirt matches the colour of your eyes.

wear
I like to wear bright colours.

match (sth)
clash
fade
run
This colour runs, so wash the shirt separately.

range from …
The leaf colour ranges from dark green to almost brown.

combination, range, scheme
We have to choose a colour scheme for the dining room.

palette
code, coding
illustration, photograph, photography, picture, plate, printing, reproduction
monitor, printer, screen, television

in colour
The flowers are pale blue in colour.
Is the film in colour or black and white?
The book is lavishly illustrated in full colour.

in a colour
The scarf is available in six different colours.

a combination of colours, a range of colours

bar (BrE), barrier (AmE)

of colour (esp. AmE)
people of colour

on the basis of colour, on (the) grounds of colour
to discriminate on the basis of colour

heightened, high
You could tell she was excited by the heightened colour in her cheeks.

faint

have
You have a little more colour in your cheeks now.

bring
The walk brought colour to her face.

be drained of, drain of, lose
His face drained of all colour.

flood sth, rise, rush
Colour flooded her cheeks.
The colour rose in his face.
I could feel the colour rush to my cheeks.

drain
The colour drained from her face when she saw him.

come back, return
Gradually the colour returned to his cheeks.

local
a journalist in search of a bit of local colour

add, give sth, lend
His asides lent colour to the story.

full of colour