It's very interesting for mosaics. At least the examples show the flexibility and powerful varieties. But some properties should be constrained.
1. the size of bounded regions---might be a minor issue
2. How to define the final shapes of bounded regions?
3. Each bounded region should follow the edges without losing the similarity of shapes.-- a modified packing issues??
4. The color choice for each tile might be a feature.
4. Mosaics can be one of the goals. Another goal could be abstraction based on forms.