Wow, the third one is awsome!  I'd love to apply that material to all different things! What does the geometry look like?  How did you asign material?  A Walk Path would look nice!

I just used the dome twice, this is fine.

Nope.  I do'nt ever try to get fancy with AO, or IBL, Spot, Etc.,  I really like even  Infinite Lghts?