torso & limb vein textures (not normal maps) for decal?

[ubermanhk]

Hi all,
I'm trying to find a resource that has blue-ish veins for torso & limbs to be added/layered as part of a decal. I know there are a few normal/bump/height maps for veins floating around, but i'm really just looking to subtly incorporate a simple texture into the skin's appearance (like for cold skin, not nasty varicose... see attached pics). Can any good soul kindly point me in the right direction for this?
Many thanks!

 

[ubermanhk]

and here's another (better?) image of the sort of effect I'd like to acheive: