Mine look a lot like the one's from the dex, but i don't use as complicated a colour scheme as theirs.
black spray
bestial brown undercoat
heavy drybrush camo green
mithril silver on rims and such
drybrush rotting flesh on
for their skin, just rotting flesh mixed with a bit of camo green and a bit of golden yellow. Add more rotting flesh to make it more uniform, or add less to make certain areas look more yellow/green than the other areas.
bolters/bolt pistols, scab red with mithril silver and/or chainmail. easily done.