So here’s my street scene - nothing spectacular, just some cubes to make buildings and stuff. Made a sidewalk too. 
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You will come to it in one of the next sections anyway, but if you wanted to add a splash of colour;
- create a Material as you would a Cube (right click - create … ),
- give the material a sensible name, perhaps “Concrete” or “Tyre” for example
- in the Inspector, set the Abledo to a colour of your choice
- drag and drop the materials onto your models
Enjoy! 