Magnification challenge? 
Depends on how it ends out.
Most of the things I start are later ending up in the trash. So for now it's just documenting some work-in-progress

Do you know this flash version ?
No, but it's really nice, especially the motion of the cells.
It wold be a cool idea to keep zooming in on a cell and subdividing that cell... 
Your idea is indeed pretty cool! Why don't you go for it?

how are you making those thick lines along certain edges?
Well, I don't

I'm just drawing a polygon which doesn't fill the voronoi-cell completely. Bigger cell -> bigger border.
Plans for now:
Naturally-looking motion of (and interaction between) the cells.
Some sort of subdivision of the cell-area to remove the edginess.