Here's a peek at our crystal garden...I've been wanting to make one of these for so long!  We used charcoal, but it works even better with a sponge!

Up close it looks like colored cauliflower!

Here's the recipe:  6 Tbsp salt,  6Tbs. liquid blueing, 6 Tbs. water, 1 Tbs amonia...mix it all up, drop by spoonfuls over charcoal, rocks, sponge or broken bricks....squeeze food coloring on top and after about 20 minutes, the crystals will begin to form.  Repeat the next day!