Coloured Sand?
http://earthyself.com/feblog/2008/01/16/coloured-sand/
I have a project in mind, and I have everything necessary-except coloured sand. I’m not sure how to go about making it, or where I might find it. (To be fussy, I need pink, brown, green, red, yellow and orange sand-properly white too, for preference!) I could possibly use food colouring (and my mum has [...]