Welcome your guests with a rainbow mat! You can make it easily and without many expenses. You’ll need boards, a drill, sandpaper and some more instruments. Sand the faces and edges of each board with 120-grit sandpaper followed by 180-grit sandpaper. Then cut the boards into 9″-long pieces and sand the ends smooth. To paint your mat, first apply a coat of primer and let dry. Lightly sand smooth and apply two coats of paint. Insert a threaded rod through 15 pieces. Hold the rod steady with pliers while turning a stop nut onto each end to hold the rod in place. Continue adding groups of seven or eight pieces to lengthen the mat. For a more detailed instruction look here.