I have a few freelance clients, but they only give very specific, time boxed, defined tasks. As soon as they as for my opinion on how to design their site I say

I have a few freelance clients, but they only give very specific, time boxed, defined tasks. As soon as they as for my opinion on how to design their site I say 'no'. For example 'we need a tweet this button in the side bar below the search box'.