So here is test I did for an idea I have for a project for school. I just made a simple gun image, made copies and scaled them from 100% to 10%. It looks alright though if I go with this idea I will probably go with every 5% step starting at 100% since right now it shrinks down a lot near the smaller sizes. I probably wouldn't use the rainbow for a color scheme although it does add a certain humor to the work. I am also not sure of the material to use.
The other idea I have is to do something similar but break apart the shape into smaller less recognizable pieces and do the same scale progression (every 5%). Then I would have multiple stalagmites/stalactites to mess around with in both placement of them, colors and materials.