For anyone who wants to use seed balls, like Jack has talked about, I saw an idea for making them more quickly. The basic recipe is the same; 5 parts clay, 1 part compost, and seeds mixed with water.
Instead of forming mud balls by hand, one at a time, this guy's idea was to spread the mud out on a flat surface, then cut a grid, making seed squares. This is just like cutting brownies.
The squares will not roll like the balls will, which should work better when seeding hills. And, it should take less time to cut squares than roll balls one at a time.
People are using seed balls to plant crops, feed grass, and wildflowers on pieces of land overgrown with weeds without traditional tilling or planting. It's also being used by guerilla gardeners. If anyone here is doing this, maybe making seed squares will help make it more productive.