well the colouring is dependant on the symbolism. i guess there is three options so far, :)

a) colour dependant on rank/power, thus yoda luke and mace

b) colour based on unorthodox practice, ie luke and dooku

c) colour based on old/new orders, PT sabers (I-V) blue, VI green

someone once suggested that only masters ever get green, so i would have been curious to have seen obi wan getting a green saber from II-IV.

has anyone noticed how inconsistent anakins and obiwans blue sabers are? they go from light blue originally to deep blue in CLONE WARS