Similar to the image sketches, you could allow players to upload tiny 3D models, such as in .glb or .fbx format, which could then be applied to the shrubs currently already in the game - or to stones similar as in the building of runestones - to create horticultural and sculpted art.
To create such art, one would need:
- A 3D sketch (and/or purchasable 3D sketchbook?)
- A sculpting tool (gardener scissors for shrubs, chisel for stone)
- Sculptable material and/or a surface to sculpt (shrubs, stone boulders)
Big bonus if image sketches could then be used to apply textures to the sculpted figures.