Mosaics based on doodling lines

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.