A strat guitar shaped box that can be used for holding pens, growing wheat, or whatever you can think of.
As I was too lazy to draw the Stratocaster shape I took and modified some of the Lapwing_3D_Prints's objects from here: https://www.thingiverse.com/thing:5162088
For using this as a flower pot, I suggest to put the soil into a small plastic bag before.

Print the "base.stl" standing up, with supports.
Regarding the assembly, obviously the three pieces should be glued together.