How to do this material with Vray?

[manelet]

Hello!

I am trying to recreate the material in white and grey from this image http://www.archdaily.pe/pe/770990/fundacion-privada-de-arte-mel-architecture-and-design/55b01ecce58eceb33000017c-private-art-foundation-mel-architecture-and-design-photo

I think in english is called "Cement Render".

Is there a way to recreate the subtle irregularities from the real image?

I have been searching for Vismat materials, but did not found anything...maybe some of you know websites with vismat materials where I can search for it, or a technic so I can do the texture myself from a plain sketcuph color?

Ideas are welcome!
Thank you!!