To decorate a child's room, use color carpet squares to create a checkerboard pattern--either by alternating two colors or by creating a pattern with three or four colors. For a girl's room, an exciting color combination might be pink, black, white, pink, black, white and so on.
To decorate a basement party room, recreate a 1950s diner by using a black and white checkerboard pattern. Alternate black and white carpet squares to create your vintage look.
For a family playroom or a preschool classroom, a different way to add education into decoration is to use carpet squares to play games. Create a hop scotch board with multiple color carpet squares. Use numbered carpet squares (create the numbers with tape or paint) to edge the room and allow the child to jump from square to square while counting. A portion of the room could be the "alphabet game" with a square per letter. Create games where the child runs to the specific letter once it is called out loud.