Awesome patterns and just so you all know, this is an art form imported into Brazil from Portugal. You can find this cool mosaic type sidewalk all over Lisbon.
If you ever watch them repairing one or setting up a new mosaic sidewalk, it's labor intensive and it does require skills, each stone is shaped in a certain way with small chisels and hammered into place carefully so they don't brake but fit together perfectly to form the desired design.
Here is her post:
One of the things I love here in Santos are the sidewalks. This pattern is the most common, and I think it's called Rio, because they have this design all over Rio de Janeiro as well.
You can read more on Jessica's post HERE.