So, i had a couple of nid models left over and decided to experiment. They came out quite nice so I thought I'd do a little tutorial. The pics are in order so watch the slideshow from the beginning for step by step. The method is
Step 1: prime white (no pics).
Step 2: wash 'flesh' with any colour, I used green on one and red on the other.
Step 3: Paint shell grey (or another neutral colour).
Step 4: wash whole model devlan mud.
Step 5: Paint recesses in 'flesh', teeth, claws, edge of shells etc bleached bone and tongue purple.
Step 6: On bigger models add a few highlights (optional)
Step 7: Do any extra details (optional)
If you don't do step 6 and 7 then a normal gaunt with take around 3 minutes. Remember that a spray gun would be dead useful for stp 1, 2 and 4.