Ganny - your quilt blocks are wonderful!!
Have4Boys - great to see you & glad to have you in the swap!
Uk'n'usa - Congrats!!! I certainly understand. Jump in when you can.
After reading everyone's valuable input and in the spirit of trying to be as inclusive as possible, this is what I suggest:
All swappers are to make 3 sets (24 blocks - 12 light/dark and 12 dark/light)
Each swapper can decide paper on/paper off - either one is fine
Each swapper can use whatever mailing method is most cost-effective AS LONG AS you make sure to pay for return postage.
How does that sound?