sass_perebor_color.sass

$tile-len: 50
$tile-color: $nav1-col,$nav2-col,$nav3-col,$nav4-col,$nav5-col,$nav6-col,$nav7-col

@for $i from 1 through $tile-len
  &:nth-child(#{$i})
    .big-block
      background: nth($tile-color, $i % length($tile-color) +1)
      &:hover
        background-color: lighten(nth($tile-color, $i % length($tile-color) +1), 2%)