swaps are: you sign up to participate, make the required number of blocks, send them to the hostess, when all blocks are received the hostess (swaps) them and returns the same number of blocks to you which were made by the other paricipants so you get a (sampler) of blocks made by different people...
not sure what you are asking about the quilt blocks...(12 1/2 " blocks made in a certian pattern, put together to make a quilt) that's what quilt blocks are...could be any size, style, color...
hope this helps