Here is another thought. I've bought cute panels like this before:
https://www.fabric.com/buy/0327957/m...ork-panel-grey
Now, months later, who got the spaceman, who got the rocket? If I got the alien, or all three, I would not consider it a duplicate...but there is a chance someone will get 2 rockets in two swaps. This is hard to be perfect, but I am determined to be happy no matter what the delivery or turn out.....I even got my own package back one swap, but I was happy because I sent out all cuties.