Render a graphical pattern where each pixel is colored by the value of 'x xor y' from an arbitrary color table.

ListDensityPlot[
 Table[Table[
   FromDigits[BitXor[IntegerDigits[x, 2, 8], IntegerDigits[y, 2, 8]], 
    2], {x, 0, 255}], {y, 0, 255}]]