If you are making scenery for a sci-fi game then crab skeletons
    and the hard shelled remains of other sea-life can be a cheap and easy 
    way to spice up the terrain. I particularly to combine them with the 
    arid terrain, evoking an image of long-gone seas, perhaps banished by 
    terraforming, where these giant and exotic creatures once roamed.
    
    
 
  Construction
    
  Plaster Reinforcement
    Many sea shells such as this crab shell and sea urchin shells are 
    very fragile. If you just stick them to a base then they will just disintegrate. 
    To prevent this, mix up some fairly runny plaster and smear a thick 
    layer (half an inch or so) into the inside of the shell. 
    
  Ancillary parts
    As well as the main crab carapace, I also dotted around some other fragments 
    of shell to give the impression of the remains of a whole animal.
  
  Attaching to base
    The shell parts should be stuck to the base at Stage
    2 of the arid terrain piece process, before the terrain piece 
    has been textured. This will make it look as if they are almost embedded 
    in the ground which will be more realistic than if they were scattered 
    on top. Use plenty of PVA or epoxy
    resin.
 
Painting
  
   The crab skeleton was practically this colour already, but it was
    painted to accentuate the texture.
  
1)
    Reddish brown wash - First it was given a light reddish brown 
    wash. There was no base coat - the natural colour was allowed to come 
    through to some extent.
  
2)
    Light brown drybrush - (fairly wet)
  
3)
    Dark Spots - Note the spots are different sizes to create a more 
    random, organic look. One effect of these is to emphasise that the 
    various fragments are part of one animal.
  
4)
    Final Drybrush - After the spots had been painted on, a delicate 
    drybrush of 'Beige' Sandtex was applied over the top of the whole 
    shell. This made the spots look less stark as well as providing final 
    highlights for the main shell.