 Is this idea any good?
RobGR: Wildflower propagators make small golf-ball sized balls of dirt with native flower seeds in them, to be tossed into empty lots and other likely places.  The idea is that the seed is protected until rain melts the dirtball, and then it can sprout and has a starting batch of nutrient right there.You could probably sell those, and work some gimicky advertising off the "dirtball" name.  You could probably get some wildflower propagators to make them for you for free, if you gave back to their organization from each sale.