from Ultimate Book of Kid's Concoctions
1 small sponge
4 T salt
2 T water
2 T liquid bluing
1. Cut a sponge into several small pieces. Place sponge pieces into a small plastic or glass bowl.
2. Put on rubber gloves, sprinkle 2 T salt, water, and liquid bluing over the sponge pieces. Allow the concoction to set for 24 hours.
3. Sprinkle the remaining 2 T salt over the sponge pieces. Allow the concoction to set for an additional 24 hours.
4. Repeat step 2. Then add a few drops of food coloring to each sponge piece. By this time your crystal flower garden should be starting to bloom.
You can use cotton balls, coals, or porous brick pieces in place of a sponge to create your Crystal Rock Garden.