I'm really liking the green, but for me there is something missing.
They might look better when properly lighted, but for me they just don't pop.
They kind of just blend into a monotonous whole... (just like this wall of text hey

).
Which is perfect for Necrons but as for me...
I'd like mine to stand out a little more.
Try some lighter edge highlights on the greens and add a shading wash to the light green parts.
I'd say add a little more gold or silver to split up the large blocks of green.
The base could also stand out a little more maybe with a lighter shade of grey. however I do like the crystals on the Lord's base.
Or if you wan't with some colour theory you could use some complementing colours.
Green/Red if you want them to look like a Christmas tree...
But otherwise; if you use a Triad on the colour wheel Purple/Gold/Green work well together, this is probably your best bet.
Use a mixture these three colours and your minis will stand out a little more.
http://www.enchantedlearning.com/crafts/Colormixing.shtml OR check this out
http://kuler.adobe.com/# All that aside i love what you are trying to do.