When I hosted crochet block swaps I would sometimes have people request a specific block of theirs to be their return block. I was hoping not to get any of mine back, I made one extra of the different blocks for myself, and I think we have the perfect number of swappers to get one from everyone except yourself.
Just make some extra ones and keep the ones you want. I do the same as kassaundra. I think it would be hard for a swap leader to accommodate all kinds of different requests.
Very good then... that's what I'll do. Thanks ladies.