hiya,
Thanks guys, that helps a fair bit. i'd searched on google under both ways of spelling it but hadnt been able to find many pics at all.
Ben - thanks for the pic, thats a beautiful snake you have there!
I got two pair of anacondas recently, one pair of which i think may be axanthic. they're the same grey as the snake in the photo Ben posted, but without the yellow around the blotches. i guess you could almost describe them as smoky blue. does that sound like axanthic colouration to you guys??
i'll try to get some decent pics as soon as they've had a chance to settle properly.
thanks for your replies!
cat 
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3.4 royal pythons
2.0 corns
1.2 columbian rainbow boas
2.2 yellow anacondas
1.0 macklotts python
1.1.1 blackthroated monitors
1.0 leopard gecko