The TombSpyder looks OK IMO. BUT the lord you have there is extra nice!
I can only say that necrons do not really have much of the colour combo that would make them look good with many colours on the models. Usually a few colours with metallic look is the best IMO. (Except for those Harlequins)
Again, some colour combos could be interesting... (I have seen the blue rod & blue necrons before somewhere...)
Anyhow, nice pics.