There are pros and cons to both. Concrete would be nice and austere and carry the inside concrete floors outside. Limestone would add some warmth (can't believe I'm saying that...) and perhaps tie in with the limestone cladding on the front of the house.
But my dream pavers? These babies:
They're long, they're linear. They have tonal variations (differences in color). Unfortunately, like all the cool stuff, they ain't cheap. This thread suggests they run $9 a square foot. We need about 480 square feet of paver stuff. Limestone in 2-foot by 4-foot chunks is running about $7 a square foot, so these guys would be a "slight" premium. But man, all these "slight" premiums start to add up...
Since we're having a pleasant chat about landscaping, let's talk about planters. The architects would like to see some planters out back in these places:
They're thinking metal, probably the rusty kind, like these posted up at Houzz:
But I'm wondering about doing something like this:
which is something I photographed at the new Hop Doddy's off of Anderson Lane. I kinda dig that board-line look.
The landscape architect is thinking limestone block for the garden beds out back, but I think this concrete business would work there as well, or perhaps something like this I saw at the Wildflower Center:
And while we're on the landscape topic, we'd love to have one of these purple martin houses:
Spacey (and mosquito free)!