Hues for the Season
Earthy shades are very much in vogue. Colours like chocolate brown, caramel and golden brown look fabulous and go well with the dusky Indian complexion.

Mix ‘n’ Match
For those willing to experiment the trend is to mix and match two or more colours to get a dazzling funky look. For instance, blondes blend well with brown or brown hair goes well with copper streaks. But remember, whenever you mix two colours, one should be subtle compared to the other.

Complexion and colours:
Hair colour should be selected according to your complexion as it decides whether you can carry off a colour or not.

Fair Skin:
People with this complexion should go in for copper and gold shades.

Dusky skin:
Dusky beauties should go in for light brown and burgundy shades. Since these are dark shades they do not shout for attention, thus giving a very natural yet glam look.

Dark Skin:
This skin tone goes well with darker shades of reds like reddish brown, reddish black and preferably colours with a tinge of red.

Application Fundas

Always test the product before application. Do a small skin test, on your hand to ensure that you are not sensitive to hair colours.

Always apply the colour in a way that it has least contact with the scalp.

If you want to go for lighter shades from darker shades, for instance, black to brown or brown to blonde, you’ll have to remove the present colour from your hair and then apply the colour you want. Bleach can be used to remove the current colour.

Face Facts:
Colour can make your hair look flatter than it actually is. So keep the shape of your face in mind as you choose the colour

Round Face:
Choose a dark shade like brown or burgundy as lighter shades like blonde make he face look bigger.

Oval face:
Choose a lighter shape on the top and a dark shade below.

Heart shape:
Choose a light shade like blonde or copper gold

Hair Care:
Use shampoos and conditioners meant for coloured hair
Wear a hat when outdoors, to avoid sun exposure, as it wears off the colour.

Some more tips can be found here - http://fall.about.com/od/fallfashionbeauty/a/colorforhair.htm