I think it's interesting to look at Disney's choices of pavement in the parks over the years. In the early days, the ground seemed pretty utilitarian (the anecdote of guests' heels sinking into the fresh pavement on Disneyland's opening day). Then there's the rumor that Kodak recommended red pavement for MK and Epcot because it made photos pop with color.
Later, Disney went in on theming the ground guests walked on. See the sewage canal backstory of Liberty Square, the bricks of Main Street, the cobblestones in pavilions around World Showcase, or the Dinosaur prints at AK.
Then for a while, Disney seemed to smooth all uneven surfaces over for accessibility and guest safety. I'm not sure how many ankles were twisted or how many trip-and-fall lawsuits may have been brought against the Mouse, but they sort of went back to utilitarian pavements that only hinted at theming.
The recently-completed repaving on MK's Center Street is real brick, but on a smooth concrete foundation. I'm hopeful at Epcot, Disney continues to build on themed guest walkways like the LED lights and Animal Kingdom's glowing patterns.