Green. Definitely alive, at one point. Is it an alien landscape, captured by some NASA probe and enhanced in post production? Hulk's blood? Not quite, but close. The answer is a bit more earthy than that:
It's tree blood! Chlorophyll, to be precise. It's been sandwiched on a microscope slide, photographed and delivered to your eyeballs by Tara Cronin, a photographer who created this image, and one that's a bit more intimate, as part of her "T for Transition" art series.
The more intimate one is a bit easier to figure out:
Yup, blood. Her blood. She keeps a small vial in her fridge and apparently photographs it for art shows from time to time, because, well, why not? [Discover]