This one is as simple as beautiful.
Configure some parameters and get a kind of tentacled-star-or-something.
Bottom is flat, designed for sticking on walls, windows, or using a magnet for firdges.
Just a decoration element with many variations.
Included some STL from testing
Hope you enjoy it.
Tested with PLA at 0.2 resolution
Easy print, no supports, infill not needed (but recomended to avoid problems with top layers
Hint: Print twice (one mirrored) ang glue it. So you can make a full-volume tentacle.
Looks great when printed big !!
I use little programs like this when teaching recursion to my students. Fibonacci typical example sucks, really don't show the power of recursive algorithms.
For programmers can be a good starting point to develop recursive algorithms. Code is short and simple. Feel free to reuse, modify or do what you want with code.