In the roadmap thread in the Groestlcoin forum there is a link to the full set of photos. It is actual bodypainting, enhanced by photoshop

Here is a photo of the bodypainting without photoshop:

https://picasaweb.google.com/117485898097840479312/GroestlcoinPromoMaterial?authuser=0&feat=directlink#6021722061591658098