seed bombs

[exhale-dust.livejournal.com]

Hey grrls,

I'm planning on making seed bombs for my friends for christmas so that when spring comes we can do some city beautification. 

Does anyone know where I could buy dry red clay in the DC area?  We really have a dearth of craft/art supply stores here.   I've found some cheap online from the west coast, but i'd like to just buy it here.

thanks.



Addition:  

Seed bombs are a guerrilla gardening tool that urbanites use to plant flowers/plants illegally in areas that are inaccessible due to fences/walls/etc.  They're typically made by layering peat moss, fertilizer, dirt and seeds in a christmas ornement, but the broken glass (when thrown into an abandoned lot, for example) is not environmentally friendly.  They clay version is safer and better for the planet.  A tutorial is available here http://heavypetal.ca/archives/2007/03/how-to-make-seedballs/

They are messy/dirty, so I'll probably make little drawstring bags out of burlap to put them in for gifts.  Otherwise, fill your pockets, walk around the city and beautify!  (but don't get caught, guerrilla gardening is illegal)