I did some extensive googling for a photo of a puddle of blood. I had to skip past 28,000 photos of an item called the "blood puddle pillow". Apparently the Internet needs a lot of pictures of that.

I finally found a really gruesome photo from a slaughter house in the Middle East. Apparently they have this big one-day-a-year bloodfest where they kill animals a certain special way. Some tourist went around photographing the event  Anyway...

I carefully sampled the colors, built a reasonable approximation of the bumpy patterns the coagulating blood makes, and changed the reflection IOR to that of water, which seems to be close to right.

Here is my test render. I uploaded the material to my free stuff, random shaders area:

http://sites.google.com/site/bagginsbill/free-stuff/random-shaders

You'll find there a file called BloodPuddle.zip. It just contains the shader and a thumbnail. Install those in your materials runtime library and apply to the puddle.

It uses displacement and bump, so you want to enable displacement and ray-tracing for the full effect.

 

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)