Step 1: Materials
Clay from your area if available or if clay unavailable in your area you can use crayola air dry clay and is found in walmart for about $5.00 (used to protect the seeds from insects, birds, etc. that might eat them)
Water (For forming clay, do not water seed bomb when finished)
Seeds native to your area (Check with your local Nature Conservancy or your state's department of natural resources for which seeds/plants are native to your area)( buy seed mixtures of native flowers and plants. Not only will they grow well, they will not crowd out other plants, disrupt bird and insect populations, or do other environmental damage)
Compost or worm castings
Yogurt container top or any large flat surface
For the dried red clay mix 5 parts clay with 1 part compost and 1 part flower seeds, put some careful drops of water into the mixture(make sure not to make it into a goopy sloppy mess!), Knead with hands into a ball, flatten it out and cut to desired size. Now just make into a small ball and let it dry in the sun. Now you have a red clay seed bomb.