I have seen various websites that have advertisements telling you that you can make thousands of dollars a month by doing simple things online. I don't know for a fact, but personally I think that if it sounds too good to be true, it probably is. I live in New Zealand and we don't have websites that you can make money off here. They are mostly in and around the US. In life, to make any type of money you will have to work hard. There is no easy way. The best idea I have is to start a business designing websites for businesses. That is all online/computer work and the best designers are paid very very well.
You are right, a good web designer can make a good income online and it is one of the highly paid professions. There are also some simple ways of making money like PTCs, Ad programs etc that I have tried where there is also possibility of making little amount of money. It is good as a leisure time of making money online.