Crystal growth related activities
Growing Crystalline Trees
www.msm.cam.ac.uk/phase-trans/2002/crystal/a.html
Making a crystal garden
www.nuffieldfoundation.org/practical-chemistry/making-crystal-garden
Egg geodes
thehappyscientist.com/science-experiment/egg-geodes
More on snowflakes and snow crystals
How to grow a borax crystal snowflake
chemistry.about.com/cs/howtos/ht/boraxsnowflake.htm
Make your own magic rocks
chemistry.about.com/od/growingcrystals/a/aa060704a.htm