My GoTour Exercise #46 (http://tour.golang.org/#46) solution

gistfile1.go

package main

import (
  "code.google.com/p/go-tour/pic"
)

func Pic(dx, dy int) [][]uint8 {
  s := make([][]uint8, dy)
  for y := range s {
    s[y] = make([]uint8, dx)
    for x := range s[y] {
      if (x+1) % (y+1) == 0 {
        s[y][x] = 192
      }
    }
  }
  return s
}

func main() {
	pic.Show(Pic)
}