at the moment i have been using 2 or 3 of the same styles of building my websites but i think i might make more sales if i add some differing layouts to what i am using at the moment do you think it is a good idea to change around my site layouts every month or two so that they all do not look the same?

i dont just want to change the colors on my sites though but actually where ads and pics show up as well as the sizes of the pics and ads and how many pages each site have on them would this help me make more sales you think