If you are looking to make your own custom fire pit check out this website!
They have every thing you need to create your own fire pits and fire bowls. Almost every fire pit they have can be converted to propane with a simple conversion kit. If you need a custom made fire pit give them a call and they can get you whatever you need.
The fire bowls in the picture are more than likely concrete fire bowls you can find all you need and more here: http://www.firesidexpressions.com/fire-features/concrete-fire-bowls

So cool!