Recent comments seem to confuse me...
Jane, isn't a 'set' a group of 6 blocks that can all be made with the same fabric and all be alike? That is how you did the sets during past swaps....
It's my understanding that you are ok with a set containing blocks that are different, that they don't have to be all the same, and that if they are not all the same, then it makes it easier for you to swap them out.