How Can I Change My Skin Colour?

Don't go into sun and keep trying to avoid sun rays.

Well there are two kind of people in this world one those who want to get something from life which they don't already have or might be they have but they are not satisfied. And others who know how to look different while having the same personality.
Back to your question now.
Well again there are two kind of people. Those who want to make their complexion fairer and fairer and those who want to look tan as its now a days a style symbol.
If you want to be fair, you can use any kind of fairness cream; not any kind of but any with a good reputation and a name. :) Avoid contact with sun rays. Use pure milk twice a day. Try to be happy and tension free.
And if you are a Muslim you can be fairer by reciting DAROOD while looking in a mirror and you can cramp YA NOORO in beads as well.
This is the simplest solution of your problem.

You can get chemical peels not only do they keep you looking young that help get rid of frickles and aid to lighten the skin. Wear sun block always before stepping outside. Peels cost around 80.00 at your local spa.