Vallejo color suggestions for these mean 'ol aliens (GW Tyranids)

A couple months ago I picked up the Battle of Maccrage as an entry into Warhammer 40K.  I've put off painting them, but now it's 'bout time I get off my butt and start.

I've been thinking of how I want them to look and found an example I like and am considering.  I'm not that great at color matching and was wondering if anyone had any suggestions as to which Vallejo colors would work for this.

Here's a link to the example (painted by Ed Phillips). 

I also like the orange on this example (painted by Chris Daly).

These are among 43 examples from a WH40K Tyranids Staff Painting Contest.  There are a couple more examples in this Tyranid gallery.