Blender procedural texturing (texture nodes) - Stained Glass

OK, I'm jumping back into Blender after an extended hiatus.  First steps, play with new stuff.

This morning, I decided to try and create a stained glass texture.

Here's the node setup:

 As you can see, the color output is mapped to color and specularity; the bump output is mapped to inverse normals.

Here's the test render:

I know it needs some work, but this could be a really nice effect.