At convention we do, what is called: Swapping. Basically, people make card fronts and swap them.
There are organized swaps and random swaps. Organized swaps have specific parameters to follow and a specific number to make. The random swapping is: walk around and swap with who ever! You wouldn't believe the number of swaps people do. I mean Hundreds! 500+! I guess it does make sense, as there will be over 5000 people attending this year, but I can't imagine making over 500 cards!
My goal is to go with 100 cards to swap and maybe 50- 3D items. If time permits (which I doubt it will, Lol) I would love to also do some 3X3 to swap.
Here is one card I have made to swap. I've made 26 of these cards and I'm really happy with how it turned out. It uses the stamp sets: Papillon Potpourri and Delightful Dozen, The new Gingham washi tape (yum), and Whisper white, Crumb Cake, Baked Brown Sugar, Daffodil Delight, Coastal Cabana, Temping Turquoise Ink and Card Stock.
Have a wonderful day and happy creating!