It can be done easily with Stitie Space.
Just paint the Shape (which is also Form) in three or less dimensions, then dump it somehow.
It's easy to break this key, but it can be augmented with Mathematics and Programming.
Automated tool for such key creation can even be made (involing Maths & Arts).
Animations can be used as well.
Each node has data (state/color) and strategy (which is also code/data/state/color). Together they form a whole node's color.
Depending on color (of each of nodes, but also color of all nodes), which can be mixed and used any way Artist desires, whole cryptographic key is made.
The more complex Form, the harder key to break.