Ironically thats not a bad idea, you can work on it over a long period of time (making small incremental improvements) like a bonsai tree, without the disadvantage of it keeling over if you don't. Of course you lack the physical touch (I assumed you meant digital 3D models, I guess 3D printing multiple iterations could work too), but you can win em all

Tutorial for Blender: https://youtu.be/NNJiVmC1-kA

There is a Lego cherry blossom bonsai. instead of making a custom part for the flowers, they use pink frogs.

Or buy a lego bonsai