Go Tour Exercise on Slices - http://tour.golang.org/moretypes/14

pic.go

package main

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

func Pic(dx, dy int) [][]uint8 {
	a := make([][]uint8, dy)
	for y := 0; y < dy; y++ {
		a[y] = make([]uint8, dx)
		for x := 0; x < dx; x++ {
			a[y][x] = uint8((x^y) * (x^y))
		}
	}
	return a
}

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