Thanks guys, some really good advice!
Fortunately I have a good photo printer, but as people here have been  saying the images lost detail when scaled down. Maybe I could try vector graphics like Alpha suggested, failing that I could print out the symbols on card, and cutting with a fine tool use them to make stencils. Its Blood Angels so the symbol isn't the easiest to freehand unless I just use the blood teardrop. Will post if either ends up working 
 
 GlynG wrote:
[b] Here are a couple of photos of my Raven Guard so you can see how it came out (see the icon on the Dreadnought for probably the smallest one I printed), sorry the photos are a bit blurry link and link
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Legion 4 wrote:
...  I did use one of the Slammer Merc unit symbol whose icon is a Wolf head on my Space Wolves Ternimators. 
Nice! These pictures really make me want to give it a go... 
Legion 4 wrote:
 These Terminators, are in dark foreboding utilitarian efficient looking colors ... like real soldiers ...   
 
  As marines should look    
