It's easy to create the stamped cuboids using pieces scored at 1/2", 1, 1 1/2" and 2 and adding a tab then fold into a cuboid shape. I tried slotting the acetate into both columns. It felt a little bare though, and continuing on with the purple theme, I remembered I'd got Alison Bomber's set she's produced for the Fodder classes EABF and it contains a blackberry stamp.
I stamped one side with Stazon white Pigment ink and painted the opposite side with shades of Amethyst.
Once you've slotted in the acetate to each open cuboid, seal them with double sided tape and then trim two more to fit into the horizontal gaps.
You can see the stick, which I painted blue and trimmed to size and mounted onto the base.