Neat concrete lights

I really like how these lights came out in this instructable.  Its not the first time I have seen something like this, but its the nicest one in a while. I would love to try something like this, but I am pretty sure I will not have the time to do so for a while.  Additions I would make would be to have an indent in the top maybe for a planter, and add in a hole on the top for a solar panel (so I am not dependent on external power source).

http://www.instructables.com/id/Concrete-lighting/