Why are spriggans blue?

in the recent elder scrolls online video, the spriggans have appeared as blue? why is this

Linky?

Was it maybe the lighting?

I know what you mean, there was a seemingly blue spriggan during with some of the in game footage released a few months ago.
As Azure's Star said, it could be the lighting but I doubt that. I'm just going to simply say it's a different type of a spriggan, maybe just a stronger or weaker version of one, or maybe some sort of corrupted or augmented type.
The green colour was obviously a choice of colour to suit it's background and what the creature is, which is a guardian of the flora and fauna. A blue version is..an odd choice to say the least.