We have some Japanese Popcorn, and I believe a few varieties of our colored corn can be used as Popcorn, but in general, they must be a LONG season corn that is used to dry out in the later year. (in other words, not for us northwesterners) I'll see how the Japanese stuff does.
I honestly would love to have some swaps going on though when the growing/harvest is over. I'd love to share some of my own beauties with others, especially such things like our Blue Potatoes. Had those for several years now, and had them passed down to us from some neighbors who have been growing them up in the hills for generations. They're the hardiest potato out here, beautiful rich purple coloration, and are the most delicious I've ever had!! Great for fries, mashed potatoes, etc. Never tried them baked though. We currently have a HUGE box full of "seedling" potatoes waiting to be planted for next year.
We sadly never got to save any Tomato seeds last year. Our tomatoes were having such a rough time with the poor weather and no greenhouse, then with the drought that pushed them further to their limits. When I finally got a greenhouse up, I had every single plant bearing fruit, but only got ONE tomato ripened and eaten out of all 40 plants. Really sad. They ended up all dying out due to cool temperatures. Lots of little unripe green tomatoes all over the place. . .
That one tomato was amazing though. Was a Brandywine. Amazing texture, delicious flavor. . . Aaah.