This site has some great looking heirlooms for the garden. So, go out and garden!
They even have some regional wildflower mixes, which I'm thinking will be good to mix into seedballs.
here's another site for heirloom seeds, in canada. these are suited for northern gardens. he provides many open-pollinated varieties of veggies, flowers, herbs and ancient and traditional grains. he also provides a short history of the varieties.