What have you tried? What thoughts do you have? Have you looked at the Vision Utilities on the Vision and Motion Palette?
I've not done this, myself, but I did make a black-and-white checkerboard pattern (with the size of the checks an input parameter), outputting a 2D U8 array that was "turned into" an image. The functions necessary to "tile an image" do seem to be present in Vision Utilities.
