Step 2: Cardboard Shapes for the Crystals to Grow On
For this Instructable, I made a tree formed out of two cardboard triangles, roughly 2" at the base and about 3.5" high. If you'd prefer some form of unspeakable tentacled beasty, send me a picture!
Cut a slot from the top to the middle in one piece, and from the bottom to the middle in the other. The slots allow the two pieces to be assembled into a 3D shape.
Make sure that whatever shape you create can stand up by itself.