People have been trying to start seeds in weird stuff for a long time. From gravel to packing peanuts, just about everything has been tried. The great thing about seeds is that they come pre-packaged in a neat shell with all the nutrients they need to germinate and thrive for the first few weeks of their lives. This means that the requirements of a seeding material are few. Most seeds require only three things from their media: http://www.garden-pot.com/