Add random pattern on berep

Hi,

Can anyone help me to add a random pattern to two separate breps?

I am trying to create an organic patter on my 'petal' shapes and I don't know how to make it in order to have different patter on each surface.

I attach a photo of the geometry I am trying to add the pattern to and a plan view of the pattern I am trying to achieve. 

Thank you in advance!