Aunt Patti gave us a kit similar to these:
It includes two cardboard "tree" pieces that you bend in random directions, fit together and put into a plastic base.
You then pour a little packet of "crystal water" into the base and wait...
It soaks it all up and then starts growing crystals on the branches... quite quickly!
How cool is this??
Every time we looked, there was more!
The finished tree... so pretty!